n.
Pronunciation: ' wo ̇ r-b ə l
Function: noun
Etymology: Middle English werble tune, from Old French (Picard dialect), from werbler to singular expressively, trill, of Germanic origin; akin to Middle Dutch wervelen to turn, Old High German wirbil whirlwind ― more at WHIRL
Date: 14th century
1 : a melodious succession of low pleasing sounds
2 : a musical trill
3 : the action of warbling