힘내 (casual) · 힘내요 · 힘내세요 (polite)
cheer up; hang in there; you can do it
Example
내일 시험이 있죠? 너무 걱정하지 말고 힘내세요!
You have an exam tomorrow, right? Don't worry too much — you've got this!
Word parts
힘 'strength' plus 내다 'bring out': literally 'bring out your strength'.
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