all clear

noun

1. the signal that an air raid or other danger is over.

all clear

noun

1. a signal, usually a siren, indicating that some danger, such as an air raid, is over

2. an indication that obstacles are no longer present; permission to proceed

   he received the all clear on the plan

Word History and Origins

Origin of all clear¹

First recorded in 1915–20

Related Words

• green light