Earn (one's) corn British informal verb phrase
To be successful and worthy of the money that one is being paid
You should work harder to earn your corn. Otherwise, sooner or later you will be fired.
He is satisfied with his secretary because she really earns her corn.
Deserve the pay or reward that you get because you do well
Used to say that doing something is always/never a wise or advantageous idea, or always/never produces a positive effect
The verb “earn" should be conjugated according to its tense.