Past participle of swear, typically implies a promise or an oath.

वचन देना या कसम खाना

English Usage: He had sworn to tell the truth.

Hindi Usage: उसने सच बताने का वचन दिया था।

To make a solemn promise or commitment.

कसम खाना

English Usage: I swear to tell the truth in court.

Hindi Usage: मैं अदालत में सच कसम खाता हूँ।

a traditional oath or promise in some cultures

सामाजिक कसम

English Usage: The bayat was given during the ceremony to solidify their partnership.

Hindi Usage: समारोह के दौरान सामाजिक कसम दी गई ताकि उनकी साझेदारी को मजबूत किया जा सके।