(vulgar) to whore (to hire a prostitute)

to walk back and forth

(informal, figuratively) to go too far

(informal) things are going OK

(figuratively) to look for another sexual partner; to cheat on one's partner, to have an affair, to engage in an extramarital relationship

(vulgar, offensive) to go fuck oneself

(figuratively) to go to heaven, to die

(informal) to work itself out, to be plain sailing.

to find out what's going on, to go to see what's happening, to go get the news

(informal) to get lost, go to hell