通用

to use anywhere, anytime (card, ticket etc) / to be used by everyone (language, textbook etc) / (of two or more things) interchangeable

to go through / to know well / (suffix) expert / to connect / to communicate / open / to clear / classifier for letters, telegrams, phone calls etc

classifier for an activity, taken in its entirety (tirade of abuse, stint of music playing, bout of drinking etc)

to use / to employ / to have to / to eat or drink / expense or outlay / usefulness / hence / therefore