dive

To swim under water.

To jump into water head-first.

To jump headfirst toward the ground or into another substance.

To descend sharply or steeply.

To lose altitude quickly by pointing downwards, as with a bird or aircraft.

To undertake with enthusiasm.

To deliberately fall down after a challenge, imitating being fouled, in the hope of getting one's opponent penalised.

To leap while fielding to take a brilliant catch which usually results in a wicket and appreciation.

To cause to descend, dunk; to plunge something into water.

To explore by diving; to plunge into.