strike up something

Từ điển Oxford Advanced Learner 8th

▪ I. ˌstrike ˈup (with sth) | ˌstrike ˈup sth derived
(of a band, an ↑orchestra, etc.)to begin to play a piece of music
•The orchestra struck up and the curtain rose.
•The band struck up a waltz.
Main entry: ↑strike_derived
 
▪ II. ˌstrike ˈup sth (with sb) derived
to begin a friendship, a relationship, a conversation, etc
•He would often strike up conversations with complete strangers.
Main entry: ↑strike_derived