C1idiominformaleverydayIELTS-friendly
the coast is clear
USUK
no one is around who could see you or stop you
Used when doing something secretly, often in a playful way. Also in the past: 'the coast was clear'.
In context
Tell me when the coast is clear, and I'll bring the birthday cake in.
Check that the coast is clear before you sneak out of the office.
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