all clear

all clear

n. A signal, usually by siren, that an air raid is over or a danger has passed.

all clear

n 1. (Military) 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.

all′ clear′

n. the signal that a danger is over. [1915–20]

Thesaurus

Noun

1.all clear - a signal (usually a siren) that danger is oversignal, signaling, sign - any nonverbal action or gesture that encodes a message; "signals from the boat suddenly stopped"

2.all clear - permission to proceed because obstacles have been removedpermission - approval to do something; "he asked permission to leave"