The difference between Add up and Mount up
When used as verbs, add up means to take a sum, whereas mount up means to increase over a period of time.
check bellow for the other definitions of Add up and Mount up
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Add up as a verb (transitive):
To take a sum.
Examples:
"usex Add up the prices and find out how much it will cost."
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Add up as a verb (intransitive):
To accumulate; to amount to.
Examples:
"usex If you can save even a couple of dollars per day, it will add up to a lot over a year."
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Add up as a verb (idiomatic, intransitive):
To make sense; to be reasonable or consistent.
Examples:
"usex His story just doesn't add up. Why would he have been at the restaurant the day before the event?"
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Mount up as a verb (transitive):
to increase over a period of time; to accumulate