Noun

1. the development of a bishop by moving it one square to a long diagonal; specifically, a set of opening moves where a bishop is developed to the second rank of the adjacent knight file

   • 1994: I’m not a hero, I’m not even a chessboard knight. Trying to be a priest was something of a fianchetto wasn’t it? Clever move by a poor player. — Jeanette Winterson, Art & Lies

Verb

1. to develop a bishop by moving it one square to a long diagonal; specifically, a set of opening moves where a bishop is developed to the second rank of the adjacent knight file