In biology, to be connivent.
To wink.
Hence To wink, or refrain from looking, in a figurative sense, as at a culpable person or act; give aid or encouragement by silence or forbearance; conceal knowledge of a fault or wrong: followed by at (formerly sometimes with on).
To be in secret complicity; have a furtive or clandestine understanding: followed by with: as, to connive with one in a wrongful act.
To waive objection; act as if satisfied; acquiesce: used absolutely.
To tamper: followed by with.
To shut one's eyes to; wink at; tacitly permit.