depth bomb


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Noun1.depth bomb - a bomb that explodes at a preset depth under waterdepth bomb - a bomb that explodes at a preset depth under water; antisubmarine device
bomb - an explosive device fused to explode under specific conditions
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The depth bombs dropped by the PBY had damaged the U-boat's diving planes, surface lights, and had forced the vessel to reduce its speed to 11 knots.
With their hovering ability, blimps were thought ideal for dropping depth bombs on targets.