jump onphrasal verb
Definition of jump on
1 : to become very angry at (someone) : to angrily criticize or shout at (someone) The teacher jumped on us for being late. The coach jumped on him for not playing hard enough.
2 : to strongly attack or criticize (something) She was quick to jump on her rival's poor record as governor.
3 : to get on (a train, bus, etc.) He jumped on a plane and headed home.