IPA: /ˈvaʊər/
KK: /vaʊər/
A person who makes a serious promise or commitment to do something.
The vower pledged to support the charity for five years.
Vower originates from Old English 'wōr' (meaning to vow or promise). The word refers to making a solemn promise or commitment.
Think of making a solemn 'promise' — that's what 'vower' means, someone who vows.