참가해요 · 참가했어요 · 참가할 거예요 · 참가하세요
to participate in, to enter, to take part in
Example
저는 다음 달에 한국어 말하기 대회에 참가할 거예요.
I'm going to enter a Korean speech contest next month.
Word parts
참 join+가 add
Literally 'join and add yourself' plus 하다.
Good to know
참가하다 is for formally entering an event or contest; 참여하다 stresses actively getting involved.