n. 25B6; noun a vow of silence : OATH, pledge, promise, bond, covenant, commitment, avowal, profession, affirmation, attestation, assurance, guarantee; word (of honour); formal troth.
votive.
25B6; verb I vowed to do better : SWEAR, pledge, promise, avow, undertake, engage, make a commitment, give one's word, guarantee; archaic plight.