DictionaryRoot: treowð
Old English
treowð
faithfulness, truth, pledge
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noun
troth
TRAHTH/trɑːθ/
A solemn promise of faithfulness, especially in marriage.
Etymology
The Old English noun joined truth with faithfulness and a pledge. To plight one's troth is therefore to pledge one's fidelity, especially in marriage; troth and truth are historically forms of the same word.