UP AND DOWN
An up and down refers to getting the ball into the hole in two strokes when starting from off the green or in a greenside hazard. This normally means one would chip/pitch/putt the first shot (up) onto the green and then putt the second shot (down) into the hole.
This term is easily confused with the term "scramble". The two are very similar except that in order to scramble the second stroke is always a par. When getting "up and down" the second stroke can be any score (birdie, par, bogie, etc.) and simple refers to taking two strokes to put the ball in the hole when close to the green.