all-clear

noun

/ði ˌɔːl ˈklɪə(r)/

/ði ˌɔːl ˈklɪr/

usually the all-clear

[singular]

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a signal (often a sound) that shows that a place or situation is no longer dangerous解除警报；警报解除信号
- The children hid in the basement until the all-clear sounded.孩子们躲在地下室里，直到警报响起。
if a doctor gives somebody the all-clear, they tell the person that he/she does not have any health problems没有疾病；完全健康
- (figurative) The building was given the all-clear following tests.该建筑通过了以下测试。
Topics Illnessc2
permission to do something准许；许可
- The ship was given the all-clear to sail.这艘船获得了航行许可。