애써요 · 애썼어요 · 애쓸 거예요 · 애쓰세요 (ㅡ drops)
to try hard, make an effort, strive
Example
모두 이번 행사를 위해 애써 주셔서 감사합니다.
Thank you all for working so hard on this event.
Word parts
애 'worry, inner effort' + 쓰다 'to use'.
Good to know
애쓰셨어요 is a warm way to thank someone for their effort.
Related words