dive /daɪv/ verb [I] (past tense and past participle dived, also US dove, past participle dived)
JUMP IN › to jump into water with your head and arms going in first: He dived off the side of the boat into the sea.
SWIM › 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.