"troth : (countable, archaic) An oath, pledge, or promise. (countable, specifically) A pledge or..."

“troth : (countable, archaic) An oath, pledge, or promise.
(countable, specifically) A pledge or promise to marry someone.
(countable, specifically) The state of being thus pledged; betrothal, engagement.
(countable, uncountable) Truth; something true.”

- https://en.wiktionary.org/wiki/troth#English

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