jump on

Verb

 * 1) To board a vehicle.
 * Jump on a nº9 bus, and it will take you more or less to the door.
 * 1)  To attack verbally, to criticise excessively.
 * I hate the way she's always jumping on me for the slightest little mistake.
 * 1)  To take immediate action regarding; to avail oneself of without delay.

Derived terms

 * jump on the bandwagon