Meaning of “dive” - Learner’s Dictionary

dive

verb [ I ] uk us /daɪv/ (past tense and past participle dived, past tense also US dove, past participle dived)
JUMP IN

B1 to jump into water with your head and arms going in first:

He dived off the side of the boat into the sea.
SWIM

B1 to swim under water, usually with breathing equipment

dive into/over/under, etc

to move somewhere quickly:

He heard footsteps and dived under the table.
FLY

to fly down through the air very quickly:

Suddenly the plane dived to the ground.
VALUE

If a value or price dives, it suddenly becomes less.

(Definition of “dive verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)