• n. 根据；证明；正当理由；委任状
• vt. 保证；担保；批准；辩解

来自PIE*wer,覆盖，保护，看管，看护，词源同ward,ware。引申词义担保，授权。

warrant

warrant: [13] Warrant probably goes back ultimately to werenti ‘protector’, a noun use of the present participle of Old High German werren ‘protect’, which in turn was formed from the base *wer- ‘watch, be on one’s guard, take care’ (source of English ward, wary, etc). This was borrowed into medieval Latin as warantus, and passed into English via Old Northern French warant. The central Old French form of the word was garant, which passed into English via Spanish as guarantee.
=> guarantee, ware

warrant (n.)

c. 1200, "protector, defender," from Old North French warant "defender; surety, pledge; justifying evidence" (Old French garant), from Frankish *warand, from Proto-Germanic *war- "to warn, guard, protect" (cognates: Old High German werento "guarantor," noun use of present participle of weren "to authorize, warrant;" German gewähren "to grant"), from PIE root *wer- (5) "to cover" (see weir).

Sense evolved via notion of "permission from a superior which protects one from blame or responsibility" (early 14c.) to "document conveying authority" (1510s). A warrant officer in the military is one who holds office by warrant (as from a government department), rather than by commission (from a head of state).

warrant (v.)

late 13c., "to keep safe from danger," from Old North French warantir "safeguard, protect; guarantee, pledge" (Old French garantir), from warant (see warrant (n.)). Meaning "to guarantee to be of quality" is attested from late 14c.; sense of "to guarantee as true" is recorded from c. 1300. Related: Warranted; warranting; warrantable.

1. The allegations are serious enough to warrant an investigation.

这些指控很严重，有必要进行一番调查。

来自柯林斯例句

2. Officers armed with a search warrant entered the flat.

警察们持搜查证进入了那所公寓。

来自柯林斯例句

3. By accusing the King of murder, he signed his own death warrant.

他指控国王谋杀，从而让自己走上了绝路。

来自柯林斯例句

4. No matter was too small to warrant his attention.

再小的事也会引起他的注意。

来自柯林斯例句

5. All entrants must warrant that their entry is entirely their own work.

所有参赛者必须保证其参赛作品完全是自己创作的。

来自柯林斯例句