warbler

plural warblers

1. Any of various small passerine songbirds, especially of the family Sylviidae (Old World warblers) and Parulidae (New World warblers).
2. obsoleteApplied formerly to various other passerine bird families, such as the Australian Acanthizidae.
3. One who warbles.

   In lulling strains the feather'd warblers woo.

   a. 1740, Fragment on Hunting, Thomas Tickell

   1 more example

   And it looked like at first she was just another pop warbler, and “Girls Just Want to Have Fun” is a great record, but nothing threatening, nothing strange.

   2012, Joe Bonomo, Conversations with Greil Marcus, page 87

4. A device that makes a warbling sound.

   In electronic telephones, this ringer may be a small electronic warbler rather than a bell.

   2011, Leif Madsen, Jim Van Meggelen, Russell Bryant, Asterisk: The Definitive Guide, page 598

5. UKslangA hissy fit.