en passant
special move in chess where, immediately after a pawn makes a 2-step move, if it could have been captured by an opposing pawn had it advanced only 1 step, then the opponent can capture the just-moved pawn “as it passes” through the 1st square
en-US/ˈɛn ˈpæsənt/
en-GB/ˈɛn pæsənt/