excuse

• n. 借口；理由
• vt. 原谅；为…申辩；给…免去
• vi. 作为借口；请求宽恕；表示宽恕

ex-, 向外。-cus,原因，词源同causal, because.

excuse

excuse: [13] Etymologically, excuse means ‘free of accusation’. It comes via Old French from Latin excūsāre, a compound verb formed from the prefix ex-, denoting removal, and causa ‘cause’ – but ‘cause’ in the sense not of something that produces a result, but of ‘legal action, accusation’ (a meaning preserved in English ‘cause list’, for example) Originally, the s of both the noun and the verb was pronounced /z/; the /s/ of the modern English noun arose by analogy with such nouns as use and abuse.
=> accuse, cause

excuse (v.)

mid-13c., "attempt to clear (someone) from blame, find excuses for," from Old French escuser (12c., Modern French excuser) "apologize, make excuses; pardon, exonerate," from Latin excusare "excuse, apologize, make an excuse for, plead as an excuse; release from a charge; decline, refuse, excuse the refusal of" (source also of Spanish excusar, Italian scusare), from ex- "out, away" (see ex-) + causa "accusation, legal action" (see cause (n.)).

Sense of "forgive, pardon, accept another's plea of excuse" is from early 14c. Meaning "to obtain exemption or release from an obligation or duty; beg to be excused" is from mid-14c. in English, as is the sense "defend (someone or something) as right." Sense of "serve as justification for" is from 1530s. Related: Excused; excusing. Excuse me as a mild apology or statement of polite disagreement is from c. 1600.

excuse (n.)

late 14c., "pretext, justification," from Old French excuse, from excuser (see excuse (v.)). The sense of "that which serves as a reason for being excused" is recorded from mid-15c. As a noun, excusation is the earlier form (mid-14c.).