vow
nounUK /vaʊ/
US /vaʊ/
A serious promise that you really mean to keep.
She made a vow to always help her little brother.
SYNONYMS
OTHER MEANINGS
2. To promise something very seriously.
He vowed to tell the truth.
3. A special promise made during a wedding.
The couple said their wedding vows.
4. A formal promise to do something important.
The knight took a vow to protect the kingdom.