공모해요 · 공모했어요 · 공모할 거예요 · 공모하세요
to conspire, to plot together
Example
두 사람은 회사 돈을 빼돌리기로 공모했습니다.
The two conspired to siphon off company money.
Word parts
공 together+모 plot
Literally 'plotting together'.
Good to know
Homonym warning: 공모(公募) means a public call for entries, as in 공모전 (contest).