col ‧ lude /kəˈluːd/ BrE AmE verb [intransitive]
[ Date: 1500-1600 ; Language: Latin ; Origin: colludere , from com- ( ⇨ COM- ) + ludere 'to play' ]
to work with someone secretly, especially in order to do something dishonest or illegal
collude with
Several customs officials have been accused of colluding with drug traffickers.
collude in
She knew about the plan, and colluded in it.