shoot up phrasal verb ( see also ↑ shoot )
1 . to increase very quickly and suddenly SYN rocket :
Demand for water has shot up by 70% over the last 30 years.
2 . if a child shoots up, he or she grows taller very quickly and suddenly:
I can’t believe this is Joshua – he’s shot up since we last saw him!
3 . shoot somebody/something ↔ up to cause serious injury or damage to someone or something by shooting them with bullets:
Then two men came in and shot up the entire lobby.
4 . shoot up (something) informal to put illegal drugs into your blood, using a needle SYN inject :
Kids as young as ten are shooting up heroin.