peggy

Short definition from Wiktionary

Noun

1. 1
   Any of several small warblers, the whitethroat, etc.
2. 2
   The petty officers' mess steward.

Proper noun

1. 1
   A diminutive of the female given name Margaret, also used as a formal given name.
2. 2
   Placeholder name for the party that supplies a proof.