bagatelle

Short definition from Wiktionary

Noun

1. 1
   A trifle; an insubstantial thing.
2. 2
   A short piece of literature or of instrumental music, typically light or playful in character.
3. 3
   A game similar to billiards played on an oblong table with pockets or arches at one end only.
4. 4
   Any of several smaller wooden tabletop games developed from the original bagatelle in which the pockets are made of pins.

Verb

1. 1
   To meander or move around, in a manner similar to the ball in the game of bagatelle.
2. 2
   To bagatellize; to regard as a bagatelle.