1to hit; to strike
2to fight
3(coll.) from; since
4(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[da3 san3] "to hold an umbrella", 打電話|打电话[da3 dian4 hua4] "to make a phone call", 打針|打针[da3 zhen1] "to get an injection"