1to hit; to strike
2to fight
3(in many expressions) a semantically light transitive verb used with various objects to form expressions with a wide range of meanings, e.g. 打傘|打伞 "to hold an umbrella", 打電話|打电话 "to make a phone call", 打針|打针 "to get an injection"
4(coll.) from; since
5(loanword) dozen