UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈgeɪn/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/geɪn/ ,USA pronunciation: respelling(gān)

WordReference Collins English Usage © 2020
gain - earn
If you gain something such as an ability or quality, you gradually get more of it.
After a nervous start, the speaker began to gain confidence.
This gives you a chance to gain experience.
If you earn wages or a salary, you are paid money for work that you do.
She earns $200 a week.
Be careful
Don't say ‘She gains $200 a week.’
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