• vt. 即兴创作；即兴表演；临时做；临时提供
• vi. 即兴创作；即兴表演；临时凑合

im-,不，非，-provise,准备，词源同provide.即没准备，临时做的，即兴准备。

improvise

improvise: [19] Etymologically, if you improvise something, it is because it has not been ‘provided’ for in advance. The word comes via French improviser from the Italian adjective improvviso ‘extempore’, a descendant of Latin imprōvīsus ‘unforeseen’. This in turn was formed from the negative prefix in- and the past participle of prōvīdere ‘foresee’ (source of English provide).

The earliest recorded use of the verb in English is by Benjamin Disraeli in Vivian Grey 1826: ‘He possessed also the singular faculty of being able to improvise quotations’. (The closely related improvident ‘not providing for the future’ [16] preserves even more closely the sense of its Latin original.)
=> provide

improvise (v.)

1826, back-formation from improvisation, or else from French improviser (17c.), from Italian improvisare "to sing or speak extempore," from improviso, from Latin improvisus "unforeseen, unexpected" (see improvisation). Or possibly a back-formation from improvisation. Related: Improvised; improvising.

1. They show no disposition to improvise or to take risks.

他们不愿意临时凑合或冒险。

来自柯林斯例句

2. Sometimes I improvise and change the words because I forget them.

有时，我临场发挥改了词，因为我把原来的词给忘了。

来自柯林斯例句

3. I then begin to improvise melodies vocally.

接着我开始哼起即兴创作的旋律。

来自柯林斯例句

4. There isn't much equipment. We're going to have to improvise.

设备不多，我们只能将就着用。

来自《权威词典》

5. The church organist may improvise on a ground bass.

教堂风琴手可能以基础低音即兴演奏.

来自《简明英汉词典》