Etymology
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belly (n.)

a general Germanic word for "leather bag, pouch, pod" that in English has evolved to mean a part of the body; from Old English belg, bylig (West Saxon), bælg (Anglian) "leather bag, purse, pouch, pod, husk, bellows," from Proto-Germanic *balgiz "bag" (source also of Old Norse belgr "bag, bellows," bylgja "billow," Gothic balgs "wine-skin"), from PIE *bhelgh- "to swell," extended form of root *bhel- (2) "to blow, swell."

By c. 1200 it was being used for "the stomach," especially as a symbol of gluttony, and by late 14c. to mean "abdomen of a human or animal, front part of the body between the breast and the groin or the diaphragm and the pelvis."

The Old English word for "belly, stomach" was buc (cognate with German Bauch, Dutch buik, Old Frisian buk, from West Germanic *būkaz, a word indicative of swelling, with no known connections). The plural of Old English belg emerged in Middle English as a separate word, bellows. Meaning "bulging part or convex surface of anything" is 1590s. The West Germanic root had a figurative or extended sense of "anger, arrogance" (as in Old English bolgenmod "enraged;" belgan (v.) "to become angry"), probably from the notion of "swelling."

Indo-European languages commonly use the same word for both the external belly and the internal (stomach, womb, etc.), but the distinction of external and internal is somewhat present in English belly/stomach; Greek gastr- (see gastric) in classical language denoted the paunch or belly, while modern science uses it only in reference to the stomach as an organ.

As a personal name from 12c. Belly-naked in Middle English was "stripped to the belly, completely naked." Fastidious avoidance of belly in speech and writing (compensated for by stretching the senses of imported stomach and abdomen, baby-talk tummy and misappropriated midriff) began late 18c. and the word was banished from Bibles in many early 19c. editions.

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land (v.1)
Old English lendan "to bring to land" (transitive), early 13c., from the source of land (n.). Intransitive sense "come to shore, go ashore, disembark" is from c. 1200. Spelling and pronunciation probably were influenced by the noun. Originally of ships; of fish, in the angling sense, from 1610s; hence figurative sense of "to obtain" (a job, etc.), first recorded 1854. Of aircraft, attested from 1916. Related: Landed; landing.
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belly (v.)
c. 1600 "cause to swell out;" 1620s, "to swell out" (intrans.), from belly (n.). Related: Bellied; bellying. Old English belgan meant "to be or become angry" (a figurative sense). A comparable Greek verb-from-noun, gastrizein, meant "to hit (someone) in the belly."
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land (n.)

Old English lond, land, "ground, soil," also "definite portion of the earth's surface, home region of a person or a people, territory marked by political boundaries," from Proto-Germanic *landja- (source also of Old Norse, Old Frisian Dutch, Gothic land, German Land), perhaps from PIE *lendh- (2) "land, open land, heath" (source also of Old Irish land, Middle Welsh llan "an open space," Welsh llan "enclosure, church," Breton lann "heath," source of French lande; Old Church Slavonic ledina "waste land, heath," Czech lada "fallow land"). But Boutkan finds no IE etymology and suspects a substratum word in Germanic,

Etymological evidence and Gothic use indicates the original Germanic sense was "a definite portion of the earth's surface owned by an individual or home of a nation." The meaning was early extended to "solid surface of the earth," a sense which once had belonged to the ancestor of Modern English earth (n.). Original senses of land in English now tend to go with country. To take the lay of the land is a nautical expression. In the American English exclamation land's sakes (1846) land is a euphemism for Lord.

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land (v.2)
"to make contact, to hit home" (of a blow, etc.), by 1881, perhaps altered from lend (v.) in a playful sense, or else a sense extension of land (v.1).
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Holy Land 
"western Palestine, Judaea," late 13c., translating Medieval Latin terra sancta (11c.).
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belly-ache (n.)
also bellyache, 1590s, "pain in the bowels," from belly (n.) + ache (n.). The verb in the slang sense of "complain" is first recorded 1888, American English; it appears not to have been used earlier than that, if ever, in a literal sense. Related: bellyached; bellyaching.
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pot-belly (n.)

"a protuberant belly; a person having a protuberant belly," 1714, from pot (n.1) + belly (n.). Pot-belly stove, so called for its shape, attested from 1940.

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belly-dance (n.)

also bellydance, 1883, in a British account of travels in Persia, from belly (n.) + dance (n.). In early use sometimes referred to by the French danse du ventre, which is attested by 1872 in French accounts from the Middle East. It appears as a French term in English by 1883, and its use got a boost from the performances of it at the Paris Exposition of 1889.

We agreed, and made our way to the mimic street called Grand Cairo, where we witnessed the lady contortionist who performs a series of movements, designated with charming frankness on the affiches as "La Danse du Ventre." It might with equal candor be called the Lumbar Wriggle [or] the Pectoral Squirm, for this curious Arab almeh possesses the power of moving any one of her principal sets of muscles quite independently of all the others, and can make any prominent part of her person waggle or surge, while its neighboring lines or curves preserve a statuesque rigidity. [Table Talk, September 1889]
The number of women [in the audience] was ludicrously disproportionate, and the number of American women was noticeable. Some of them seemed slightly pensive, but all were interested. Their large eyes grew larger still. They almost forgot decorum in crowding for a better view, in leaning over the backs of chairs in concentrated absorbed attention. [Scribner's Magazine, January 1890]

The English noun is perhaps a direct translation of the French. As a verb from 1963. Related: Belly-dancer (1922); belly-dancing (n.), 1921.

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