Hangul syllable Cweoss

It marks the contracted past of a Korean verb.

Hangul writes each syllable in a block; 췄 is one syllable, not a word on its own. When a verb stem ends in 추, its past form can contract: 추었다 becomes 췄다. The rest of the verb and the sentence context help identify the action.

춤을 췄어요 means “I danced”; 감췄어요 means “I hid it.” Both contain the same past syllable, but 춤추다 means “to dance” and 감추다 means “to hide.”