UP may be used for emphasis (of a completed action). It does not always indicate direction, as the opposite of "down".
Example of emphasis:
He closed up his shop. (see reading passage, Love at First Sight)
It was time to close. The barman called out: "Please drink up!" That is, empty your glass.
Give at least six similar verb + UP combinations.
Answer guide
For example: eat up, finish up, end up, open up, shut up, use up, clean up, wash up, dry up, break up, burn up, cut up, give up, settle up, pay up