What is connivance?

Connivance is a secret plan to achieve an evil or illegal end, and as a defense against a change of adultery works very much like collusion. Let’s say, for example, that a wife wished to get a divorce from her husband. If she invites someone to stay at the couple’s house while she is absent, and that someone seduces the husband into an affair, the husband could later claim that the wife connived or set him to commit the adultery in order to get a divorce.