ruche

Short definition from Wiktionary

Noun

1. 1
   A strip of fabric which has been fluted or pleated.
2. 2
   A small ruff of fluted or pleated fabric worn at neck or wrist.
3. 3
   A pile of arched tiles, used to catch and retain oyster spawn.

Verb

1. 1
   To flute or pleat (fabric).
2. 2
   To bunch up (fabric); to ruck up.