Etymology
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make-believe (n.)

"pretense, false or fanciful representation," 1811, from the verbal phrase make believe, which was used in children's talk by 1773 for "pretend;" see make (v.) + believe. As an adjective, "unreal, sham, pretended," by 1824. The noun form make-belief (1833) was "Substituted by some writers for MAKE-BELIEVE; the formation of the latter, being misunderstood, was imagined to be incorrect" [OED].

Let's-pretend (n.) in the same sense is attested by 1904 (the verbal phrase is from 1848). To make believe (v.) in the sense "cause to believe" is from late 14c.

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believe (v.)
Origin and meaning of believe

Old English belyfan "to have faith or confidence" (in a person), earlier geleafa (Mercian), gelefa (Northumbrian), gelyfan (West Saxon), from Proto-Germanic *ga-laubjan "to believe," perhaps literally "hold dear (or valuable, or satisfactory), to love" (source also of Old Saxon gilobian "believe," Dutch geloven, Old High German gilouben, German glauben), ultimately a compound based on PIE root *leubh- "to care, desire, love" (see belief).

Meaning "be persuaded of the truth of" (a doctrine, system, religion, etc.) is from mid-13c.; meaning "credit upon the grounds of authority or testimony without complete demonstration, accept as true" is from early 14c. General sense "be of the opinion, think" is from c. 1300. Related: Believed (formerly occasionally beleft); believing.

The form beleeve was common till 17c., the spelling then changed, perhaps by influence of relieve, etc. To believe on instead of in was more common in 16c. but now is a peculiarity of theology; believe of also sometimes was used in 17c. Expression believe it or not attested by 1874; Robert Ripley's newspaper cartoon of the same name is from 1918. Emphatic you better believe attested from 1854.

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make (v.)

Old English macian "to give being to, give form or character to, bring into existence; construct, do, be the author of, produce; prepare, arrange, cause; behave, fare, transform," from West Germanic *makōjanan "to fashion, fit" (source also of Old Saxon makon, Old Frisian makia "to build, make," Middle Dutch and Dutch maken, Old High German mahhon "to construct, make," German machen "to make"), from PIE root *mag- "to knead, fashion, fit." If so, sense evolution perhaps is via prehistoric houses built of mud. It gradually replaced the main Old English word, gewyrcan (see work (v.)).

Meaning "to arrive at" (a place), first attested 1620s, originally was nautical. Formerly used in many places where specific verbs now are used, such as to make Latin (c. 1500) "to write Latin compositions." This broader usage survives in some phrases, such as make water "to urinate" (c. 1400), make a book "arrange a series of bets" (1828), make hay "to turn over mown grass to expose it to sun." Make the grade is 1912, perhaps from the notion of railway engines going up an incline.

Read the valuable suggestions in Dr. C.V. Mosby's book — be prepared to surmount obstacles before you encounter them — equipped with the power to "make the grade" in life's climb. [advertisement for "Making the Grade," December 1916]

But the phrase also was in use in a schoolwork context at the time.

To make friends is from late 14c.; to make good "make right" is from early 15c.  To make do "manage with what is available" is attested by 1867; to make for "direct one's course to, proceed toward" is from 1580s, but "Not frequent before the 19th c." [OED]. To make of  "think, judge" is from c. 1300. To make off  "run away, depart suddenly" is from 1709; to make off with "run away with (something) in one's possession" is by 1820. To make way is from c. 1200 as "cut a path," early 14c. as "proceed, go."

Make time "go fast" is 1849; make tracks in this sense is from 1834. To make a federal case out of  (something) was popularized in 1959 movie "Anatomy of a Murder;" to make an offer (one) can't refuse is from Mario Puzo's 1969 novel "The Godfather." To make (one's) day is by 1909; menacing make my day is from 1971, popularized by Clint Eastwood in film "Sudden Impact" (1983). Related: Made; making.

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make (n.)

"match, mate, companion" (now archaic or dialectal), from Old English gemaca "mate, equal; one of a pair, comrade; consort, husband, wife," from Proto-Germanic *gamakon- (source also of Old Saxon gimaco, Old High German gimahho, Old Norse maki), related to Old English gemæcc "well-matched, suitable," macian "to make" (see make (v.)). Meaning "manner in which something is made, form, shape, design, construction" is from c. 1300. Slang phrase on the make "intent on profit or advancement" is from 1869.

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make-work 

1913 (adj.); 1937 (n.), "busy-work, activity of no value," American English, from the verbal expression to make work (see make (v.) + work (n.)).

A big fire devoured a street; "It will make work," I heard my father say; a ship was lost at sea laden with silk, and leather, and cloth; "It will make work," said my father; a reservoir broke jail, and swept the heart of the town away. "It will make work," my mother said; so all human calamities were softened blessings to me; they made "work," and work made wages, and wages made bread and potatoes, and clothes for me. ["The Radical Review," Chicago, Sept. 15, 1883]
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make out (v.)

c. 1600, "get along, succeed," from make (v.) + out (adv.). Sense of "obtain a clear understanding of" is from 1640s; that of "discern or discover visually" is by 1754; sense of "have sexual relations with" is attested by 1939.

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make-up (n.)

also makeup, "manner in which something is put together," 1821, from the verbal phrase (see make (v.) + up (adv.)). To make up "build, collect into one form by bringing together" is from late 14c., also "prepare." It is attested from late 15c. as "supply as an equivalent," from 1660s as "end a quarrel, reconcile, settle differences, become friends again," by 1825 as "to fabricate artfully" (a story, etc.).

In reference to an actor, "prepare for impersonating a role" (including dress and the painting of the face), by 1808. Hence the noun sense of "appearance of the face and dress" (1858) and the sense of "cosmetics," attested by 1886, originally of actors.

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puppetry (n.)

1520s, "mimic action, make-believe;" see puppet (n.) + -ry. From 1590s as "finery" (as that of a doll or puppet); by 1610s as "a puppet-show."

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Disneyland (n.)

in figurative sense of "land of make-believe" first recorded 1956, from U.S. entertainment park (opened in 1955) created by animator and producer Walter E. Disney (1901-1966).

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credo (n.)

early 13c., "the Creed in the Church service," from Latin credo "I believe," the first word of the Apostles' and Nicene creeds, first person singular present indicative of credere "to believe," from PIE compound *kerd-dhe- "to believe," literally "to put one's heart" (source also of Old Irish cretim, Irish creidim, Welsh credu "I believe," Sanskrit śrad-dhā- "faith, confidence, devotion"), from PIE root *kerd- "heart." The nativized form is creed. General sense of "formula or statement of belief" is from 1580s.

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