verb
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(intransitive) To swim under water.
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(intransitive) To jump into water head-first.
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(intransitive) To jump headfirst toward the ground or into another substance.
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(intransitive) To descend sharply or steeply.
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(intransitive) To lose altitude quickly by pointing downwards, as with a bird or aircraft.
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(intransitive, especially with in) To undertake with enthusiasm.
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(sports) To deliberately fall down after a challenge, imitating being fouled, in the hope of getting one's opponent penalised.
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(transitive) To cause to descend, dunk; to plunge something into water.
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(transitive) To explore by diving; to plunge into.
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(intransitive, figuratively) To plunge or to go deeply into any subject, question, business, etc.; to penetrate; to explore.