The coast is clear
Meaning
It is safe to proceed.
Usage
Used before taking action that requires stealth.
Origin & History
Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.
Navy lookouts reported when no hazards remained visible.
19th-century seamanship contributed the phrase.