when someone's ship comes in

when (one's) ship comes in

When one becomes wealthy and/or successful. When my ship comes in, I'm moving out of this disgusting little apartment first thing!
See also: come, ship
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

when someone's ship comes in (or home)

when someone's fortune is made.
This expression dates back to the period of Britain's maritime empire, when the safe arrival of a valuable cargo meant an instant fortune for the owner and those who had shares in the enterprise.
See also: come, ship
Farlex Partner Idioms Dictionary © Farlex 2017
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