connive

American Heritage® Dictionary of the English Language, Fourth Edition

1. v. To cooperate secretly in an illegal or wrongful action; collude: The dealers connived with customs officials to bring in narcotics.
2. v. To scheme; plot.
3. v. To feign ignorance of or fail to take measures against a wrong, thus implying tacit encouragement or consent: The guards were suspected of conniving at the prisoner's escape.

Century Dictionary and Cyclopedia

1. To wink.
2. 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).
3. To be in secret complicity; have a furtive or clandestine understanding: followed by with: as, to connive with one in a wrongful act.
4. To waive objection; act as if satisfied; acquiesce: used absolutely.
5. To tamper: followed by with.
6. To shut one's eyes to; wink at; tacitly permit.
7. In biology, to be connivent.

Wiktionary

1. v. to cooperate with others secretly in order to commit a crime; to collude
2. v. to plot or scheme
3. v. to pretend to be ignorant of something in order to escape blame
4. v. to be a wench

GNU Webster's 1913

1. v. obsolete To open and close the eyes rapidly; to wink.
2. v. To close the eyes upon a fault; to wink (at); to fail or forbear by intention to discover an act; to permit a proceeding, as if not aware of it; -- usually followed by at.
3. v. R. & Obs. To shut the eyes to; to overlook; to pretend not to see.

WordNet 3.0

1. v. encourage or assent to illegally or criminally
2. v. form intrigues (for) in an underhand manner