가담해요 · 가담했어요 · 가담할 거예요 · 가담하세요
to take part in, to join (usually something wrong)
Example
그는 범죄에 가담한 혐의를 받고 있습니다.
He is suspected of taking part in the crime.
Word parts
가 add+담 shoulder
Literally 'add one's shoulder to a burden'.
Good to know
Mostly negative contexts: crimes, riots, plots; use 참여하다 for neutral participation.