Examples of using "Passant" in a sentence and their english translations:
An innocent passer-by was shot dead in broad daylight.
The white pawn took the black pawn "en passant".
A root sits in the earth, and the passerby doesn't see it.
The thick fog made it impossible to see the building.
The "en passant" capture is a peculiarity of the pawn movement. No other chess piece can do anything like that.
If White has a pawn on e5 and Black plays his pawn from d7 to d5, the white pawn can take the black pawn, removing it from the board and occupying d6, as if the black pawn were there. This is called taking "en passant".