A husband in law only, such as one who has abandoned his wife / A husband who provides legally required support, but not love or affection

A process (for example, a court case) has been rigged behind the scenes and its outcome will not reflect true justice.

Third-person singular simple present indicative form of instance in

(idiomatic) Without disturbing one's course of activities. / (idiomatic) Without emotional upset.

plural of castle in the air

(idiomatic) A desire, idea, or plan that is unlikely to ever be realized; a visionary project or scheme; a daydream, an idle fancy, a near impossibility.

A replacement made at the last minute, usually in a sporting context. / An outsider.

Alternative form of like a hole in one's head

(slang, Canada, US) Synonym of pop a cap in someone's ass

(espionage) Of a spy: to return home after having gone undercover in enemy territory. / (by extension) To gain widespread acceptance in a group or society, especially where there was not any before.