• n. 时机，机会；场合；理由
• vt. 引起，惹起

oc-,向前，朝向，-cas,掉落，词源同case,cascade,accident.引申词义偶然，场合，时机。

occasion

occasion: [14] Like English befall, occasion depends on a metaphorical connection between ‘falling’ and ‘happening’. Its ultimate source is the Latin verb occidere ‘go down’, a compound formed from the prefix ob- ‘down’ and cadere ‘fall’ (source of English cadence, case ‘circumstance’, decadent, etc). The figurative notion of a ‘falling together of favourable circumstances’ led to the coining of a derived noun occasiō, meaning ‘appropriate time, opportunity’, and hence ‘reason’ and ‘cause’.

English acquired it via Old French occasion. Also from Latin occidere comes English occident [14], a reference to the ‘west’ as the quarter in which the sun ‘goes down’ or sets.
=> cadaver, cadence, case, decadent, occident

occasion (n.)

late 14c., "opportunity; grounds for action, state of affairs that makes something else possible; a happening, occurrence," from Old French ochaison, ocasion "cause, reason, excuse, pretext; opportunity" (13c.) or directly from Latin occasionem (nominative occasio) "opportunity, appropriate time," in Late Latin "cause," from occasum, occasus, past participle of occidere "fall down, go down," from ob "down, away" (see ob-) + cadere "to fall" (see case (n.1)). The notion is of a "falling together," or juncture, of circumstances.

occasion (v.)

mid-15c., "to bring (something) about," from occasion (n.), or else from Old French occasionner "to cause," from Medieval Latin occasionare, from Latin occasionem (see occasion (n.)). Related: Occasioned; occasioning.

1. On one occasion, his father threw a radio at his mother.

他父亲曾有一次拎起收音机砸向他的母亲。

来自柯林斯例句

2. The good weather helped to make the occasion a resounding success.

天公作美，使得这次活动获得了巨大成功。

来自柯林斯例句

3. It is always an important occasion for setting out government policy.

这历来都是阐明政府政策的重要时机。

来自柯林斯例句

4. On another occasion I answered the phone and the line went dead.

还有一回，我一接电话，就掉线了。

来自柯林斯例句

5. How can anyone look sad at an occasion like this?

在这样的场合怎么会有人显得忧伤呢？

来自柯林斯例句