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English definition of “(as) tough as old boots”

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(as) tough as old boots

very strong, and not easily made weaker: He might be in his eighties but he's tough as old boots, that man. ( US also (as) tough as shoe leather) informal Tough food is very difficult to cut or eat.
(Definition of (as) tough as old boots from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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