coast is clear
No enemy or danger is in sight; there is no one to see you.
When the teacher had disappeared around the corner, John said, "Come on, the coast is clear."
The men knew when the night watchman would pass. When he had gone, and the coast was clear, they robbed the safe.
When Father stopped the car at the stop sign, Mother said, "The coast is clear on this side."
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Source: A Dictionary of American Idioms