tohideunder something andcoveryourfaceandhead, as a way oftryingtoprotectyourself, forexamplefrom anuclearexplosion:
The phrase "duckandcover"becameastandardpartof Cold Warsafetydrillsduring the 1950s.
Loudspeakersbroadcastmessageswarningresidentstoduckandcover.
In anearthquake, somerememberto "duckandcover,"hidingunder astrongdeskor in adoorway.