verb, particle · to break or snap into pieces, especially for long or thin objects

绳子断成两截了。

verb · to come to an end; to stop continuing, especially referring to a lineage or inheritance.

如果这一代没有后代，他们家的香火就断了。

verb · to judge, decide, or determine a matter

此事很难断定谁对谁错。

adverb · absolutely, definitely, or decidedly (usually used in the negative)

你提出的要求断不可行。

verb · to give up, quit, or abstain from a habit or substance

医生建议他立刻断了烟。