The difference between Mount up and Pile up
When used as verbs, mount up means to increase over a period of time, whereas pile up means to form a pile, stack, or heap.
check bellow for the other definitions of Mount up and Pile up
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Mount up as a verb (transitive):
to increase over a period of time; to accumulate
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Pile up as a verb (transitive):
To form a pile, stack, or heap.
Examples:
"The kids piled up their boots and coats by the back door."
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Pile up as a verb (idiomatic, intransitive):
To collect or accumulate, as a backlog.
Examples:
"The requests piled up while she was away."