to have lead in one's pencil
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to be of great importance
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to be of basic importance
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to be of secondary importance
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to be of essence for a contract
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to be the strong man in the organization
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to have been of a material service to sb
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lie at the heart of, lie at the core of
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to come down to something
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to be large in the public eye
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to be on the scent of an important discovery
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It's the thought that counts.
to have a major role
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to have other fish to fry
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to have more pressing things on one's plate
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