adv. 1 by the way. 2 Chess used with reference to the permitted capture of an opponent's pawn that has just advanced two squares in its first move with a pawn that could have taken it if it had advanced only one square. [F, = in passing]
EN PASSANT
Meaning of EN PASSANT in English
English main colloquial, spoken dictionary. Английский основной разговорный словарь. 2012