Etymology
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Words related to swear

answer (n.)

Old English andswaru "a response, a reply to a question," from and- "against" (from PIE root *ant- "front, forehead," with derivatives meaning "in front of, before") + -swaru "affirmation," from swerian "to swear" (see swear), suggesting an original sense of "sworn statement rebutting a charge." Meaning "solution of a problem" is from c. 1300.

It is remarkable that the Latin expression for answer is formed in exactly the same way from a verb spondere, signifying to engage for, to assure. [Hensleigh Wedgwood, "A Dictionary of English Etymology," 1859]

A common Germanic compound (cognates: Old Saxon antswor, Old Norse andsvar, Old Frisian ondser, Danish and Swedish ansvar), implying a Proto-Germanic *andswara-. The simpler idea of "a word in reply" is expressed in Gothic anda-vaurd, German Antwort.

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answer (v.)

Old English answarian "make a statement in reply," from and- "against" (from PIE root *ant- "front, forehead," with derivatives meaning "in front of, before") + swerian "to swear" (see swear), suggesting an original sense of "make a sworn statement rebutting a charge."

Meanings "conform, correspond" and "be responsible for" are from early 13c; that of "suffer the consequences of" is from late 13c.; that of "respond in antiphony" is from early 15c. Sense of "respond in act or action, give back in kind" is from 1570s; that of "solve, find the result of" is from 1742. Related: Answered; answering. The telephone answering machine so called from 1961.

curse (v.)

Middle English cursen, from Old English cursian, "to wish evil to; to excommunicate," from the source of curse (n.). Intransitive meaning "swear profanely, use blasphemous or profane language" is from early 13c. (compare swear (v.)). The sense of "blight with malignant evils" is from 1590s. Related: Cursed; cursing.

forswear (v.)
Old English forswerian "swear falsely" (intransitive), also "abandon or renounce on oath" (transitive), from for- "completely" + swerian "to swear" (see swear (v.)). Related: Forswore; forsworn; forswearing.
sware 
obsolete or archaic past tense of swear (v.), common 15c.-17c. by analogy of past tense of bear (v.).
swearing (n.)
"utterance of profane language," mid-14c., verbal noun from swear (v.).
swear-word (n.)
1873, American English colloquial, from swear (v.) + word (n.).
sworn 
past participle of swear; sworn enemies, those who have taken a vow of mutual hatred, is from c. 1600.