Main Entry: wa·ter·loo

Pronunciation: \ˌwȯ-tər-ˈlü, ˌwä-\

Function: noun

Inflected Form(s): plural wa·ter·loos

Usage: often capitalized

Etymology: Waterloo, Belgium, scene of Napoleon's defeat in 1815

Date: 1816

: a decisive or final defeat or setback <a political waterloo>