The difference between Head up and Pile up
When used as verbs, head up means to lead or take the lead in, whereas pile up means to form a pile, stack, or heap.
check bellow for the other definitions of Head up and Pile up
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Head up as a verb (transitive):
To lead or take the lead in; to direct; to take charge of.
Examples:
"We want you to head up the effort to organize all the entries."
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Head up as a verb (transitive):
To close (a cask, barrel, etc.) by fitting a head to it.
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Head up as a verb (nautical):
To turn towards the wind
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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."