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Based on what Merriam dictionary and some of other references have noted, usage of the verb "act upon" is very rare and bottom 10% of popularity.
So how do natives convey this concept( do a promise )?
Are there any other verbs or expressions?

Yazdan Samiei Poor
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2 Answers2

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"Fulfill" or "keep" a promise is most common:

She fulfilled her promise to her dying grandmother to finish school and become a doctor.

He kept his promise never to tell what he had seen that day.

You can also "hold someone to" a promise, meaning you make sure they keep it.

Dad, do you really mean that you'll buy me a car if I get straight A's this semester? I'll hold you to that promise!

Andrew
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Live up to

Fulfil (an undertaking):

‘the president lived up to his promise to set America swiftly on a new path’

‘‘The seller didn't live up to his promises,’ he says.’

‘He has not lived up to his promise to fully disclose the identities of his top money-collectors who bundle millions of dollars in campaign contributions.’ (ODO)

To act or be in accordance with.

"had no intention of living up to his promise." (Merriam Webster)

live up to something to be as good as what was expected or promised. (Macmillan)

If something or someone lives up to a particular standard or promise, they do as well as they were expected to, do what they promised etc. (Longman)

Afsane
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