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An example sentence: "Exercising regularly would do you good."

Is a word such as "things", is omitted in this idiom? ("Exercising regularly would do you good (things).")

I don't get why an adjective(=good), but not a noun comes after 'you'. This doesn't sound grammatically correct.

3 Answers 3

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Nothing is omitted. "Good" is used here as a noun.

Dictionary.com provides the definition

Noun: profit or advantage; worth; benefit:

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The sentence and usage are correct. Here good is used as a noun. Lexico has

good
NOUN

2 [mass noun] Benefit or advantage to someone or something.
he is too clever for his own good

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Here good is not an adjective but it is a noun. here good means benefit

You are good. Here good is an adjective.

If you do good to others , they will do good to you

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