The difference between Heap up and Stack up
When used as verbs, heap up means to increase over a period of time, whereas stack up means to put into a stack.
check bellow for the other definitions of Heap up and Stack up
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Heap up as a verb (intransitive):
To increase over a period of time; to accumulate.
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Heap up as a verb (transitive):
To make an untidy pile of (something).
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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 .)