The act of binding oneself by a social, moral or legal tie.

承受约束；承担责任。

Any duty imposed by law, by promise, etc.

义务；责任((to))。

A written deed or bond by which one binds himself under penalty to do a thing; a contract.

【法律】契约(书)

A condition or feeling of being bound legally or ethically; a condition or feeling of social indebtedness.

受束缚；有义务；感恩；欠人情((to))。