The difference between Add up and Stack up
When used as verbs, add up means to take a sum, whereas stack up means to put into a stack.
check bellow for the other definitions of Add up and Stack 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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Stack up as a verb (transitive):
To put into a stack
Examples:
"Stack up the boxes."
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Stack up as a verb (intransitive):
to pile up; to accumulate
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Stack up as a verb (idiomatic, transitive):
To put a group of abstract things together.
Examples:
"to stack up memories"
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Stack up as a verb:
To compare with (something); to measure up. (Often used with or .)