Definition of dive-bombs:
(v) :
(intransitive) To swim under water.
(v) :
(intransitive) To jump into water head-first.
(v) :
(intransitive) To jump headfirst toward the ground or into another substance.
(v) :
(intransitive) To descend sharply or steeply.
(v) :
(intransitive) To lose altitude quickly by pointing downwards, as with a bird or aircraft.
(v) :
(intransitive, especially with in) To undertake with enthusiasm.