noun

1. A trifle; an insubstantial thing.

2. A short piece of literature or of instrumental music, typically light or playful in character.

3. A game similar to billiards played on an oblong table with pockets or arches at one end only.

Synonyms: bag of shells

verb

1. To meander or move around, in a manner similar to the ball in the game of bagatelle.

2. To bagatellize; to regard as a bagatelle.