floating mine

Noun
  1. An explosive mine designed to destroy ships that bump into it (synset 103369924)
    is a type of: mine - explosive device that explodes on contact; designed to destroy vehicles or ships or to kill or maim personnel
    subtypes: magnetic mine - (nautical) a marine mine that is detonated by a mechanism that responds to magnetic material (as the steel hull of a ship)
    same as: marine mine

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