verb

plunge head first into water with one’s arms raised over one’s head.

she walked to the deep end, then she dived in

plunge,plummet,nosedive,descend,jump,fall,drop,swoop,pitch,bellyflop

noun

a plunge head first into water.

he hit the sea in a shallow dive

plunge,plummet,nosedive,descent,jump,fall,drop,swoop,pitch,bellyflop,plump