Used to express urgent action to avoid immediate danger, usually in a military or violent context. The soldiers hit the deck when the firefight started.
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Figurative Use
Can be used metaphorically to mean taking action to avoid a non-physical threat such as a scandal. At the sign of trouble, the politician hit the deck.
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Instant Response
Highlights the need for immediate and reflexive action without hesitation. When the alarm blared, everyone hit the deck.