pay off in spades

To yield very significant profits or benefits following an investment (of time, money, energy, etc.). Wow, those private lessons have really paid off in spades—your Spanish sounds totally fluent! If this venture doesn't pay off in spades, we'll be forced to declare bankruptcy.

See also: off, pay, spade

See also:

in spades
(you) coulda fooled me
(you) could have fooled me
cosmic
above and beyond the call of duty
be (really) something
turn the tables on (one)
hit me again
wow
bow-wow

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