en passant
adverb
[ ɒ̃ paˈsɑːnt ]
• by the way; incidentally.
• "the singular distinction of being mentioned, en passant, in an Act of Parliament"
• by the en passant rule.
Origin:
early 17th century: French, literally ‘in passing’.
en passant rule
• the rule that a pawn making a first move of two squares instead of one may nevertheless be immediately captured by an opposing pawn on the fifth rank.
