Third-person singular simple present indicative form of submarine.(verb)
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Use "submarines" in a sentence
"Sure, that makes sense in submarines, but .... they're in the vacuum of space."
"My husband's in submarines, and when we would meet on the pier after a 6 month deployment, he would smoke one cigar with this guys as a celebration for a completed mission - and to me he looked more handsome than Harrison Ford, so rugged and sure of himself."
"The less time the characters spend in submarines or swimming, the better."