pass up

If you pass up an opportunity or an invitation, you choose not to take the opportunity or accept the invitation.
http://dlvr.it/Sk9Qcg

build on (1)

to add to what you've already succeeded in doing
http://dlvr.it/Sk6PRh

check out (1)

to pay the bill and leave after staying at a hotel, a hospital or a rehabilitation centre
http://dlvr.it/Sk3TDJ

buy out

to buy somebody's share of a company or a partnership in order to take control of it
http://dlvr.it/Sk1KqP

fool around

If you're fooling around, you're having fun by joking and being a bit silly.
http://dlvr.it/Sjz7vx

fill up (2)

to fill someone's stomach with food
http://dlvr.it/SjwCnV

knock out (1)

If you are knocked out, you are hit so hard that you lose consciousness.
http://dlvr.it/Sjp1B9