Definitions from Wiktionary ( )

▸ verb:  (intransitive) To swim under water.
▸ verb:  (intransitive) To jump into water head-first.
▸ verb:  (intransitive) To jump headfirst toward the ground or into another substance.
▸ verb:  (intransitive) To descend sharply or steeply.
▸ verb:  (intransitive) To lose altitude quickly by pointing downwards, as with a bird or aircraft.
▸ verb:  (intransitive, especially with in) To undertake with enthusiasm.
▸ verb:  (sports) To deliberately fall down after a challenge, imitating being fouled, in the hope of getting one's opponent penalised.
▸ verb:  (transitive) To cause to descend, dunk; to plunge something into water.
▸ verb:  (transitive) To explore by diving; to plunge into.
▸ verb:  (intransitive, figuratively) To plunge or to go deeply into any subject, question, business, etc.; to penetrate; to explore.
▸ noun:  A jump or plunge into water.
▸ noun:  A headfirst jump toward the ground or into another substance.
▸ noun:  A downward swooping motion.
▸ noun:  A swim under water.
▸ noun:  A decline.
▸ noun:  (slang) A seedy bar, nightclub, etc.
▸ noun:  (aviation) Aerial descent with the nose pointed down.
▸ noun:  (sports) A deliberate fall after a challenge.
▸ noun:  Obsolete form of daeva. [(Zoroastrianism) A supernatural entity of disagreeable nature, usually considered as a demon.]

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