A discovered attack is a threat revealed by moving another piece out of the way. Set up a discovered attack.
Two things happen at once, which is what makes it so hard to answer. A discovered attack with check behind it is one of the strongest moves in chess.
1noundiscovered attackA threat revealed by moving another piece out of the way.
“The whole game turned on one discovered attack.”
discovered attack is a move.
Practised in Chess & Card Games