Alternative form of proverbs run in pairs

Something which has long been desired or hoped for and which has finally happened.

Alternative form of rain or shine

Until death, until the afterlife. / (colloquial) At overly frequent intervals.

(idiomatic) One who wisely settles a difficult matter.

(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.

Alternative form of until the cows come home

(idiomatic, of an event, thing, person) To emerge, come up; be about to happen; to approach or arrive on the scene; to present (itself or oneself).

Asks for permission to enter a room.

(idiomatic) To make significant progress.