[Fantam]

A "stop n go" is when a player bets, is raised, then calls the raise on a betting round.

Then that player bets into the previous round's raiser on the next street.

So in the hand example shown earlier in this post, I think MP1 did a "stop n go" on both the turn and river.

You could also say that MP1 donk bet the flop, but the donk bet description is usually used for turn and river bets.