Definition of criminal conversation in US English:
 criminal conversation
nounˌkrim(ə)n(ə)l ˌkänvərˈsāSHən
historical Adultery, especially as formerly constituting grounds for the recovery of legal damages by a husband from his adulterous wife's partner.
 Example sentencesExamples
-  Our Supreme Court has made it clear that the tort of criminal conversation exists in our State.
 -  A physical separation will not bar a claim for criminal conversation even if the sexual relations with the third party took place after the separation occurred.
 -  The last three chapters take up, in turn, the popular literature of domestic homicide, adultery in the church courts, and cases of ‘criminal conversation.’
 -  If he has proof of sexual relationship between you and his wife then he can sue her for criminal conversation regardless of whether the relationship was with someone of the opposite sex.
 -  If this couple were then going through a spectacular trial for ‘criminal conversation’ then so much the better for attracting attention to the painter.