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| un·der·pin [ ùndər pín ] (past and past participle un·der·pinned, present participle un·der·pin·ning, 3rd person present singular un·der·pins) |
transitive verb |
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1. support from below: to support a weakened wall or structure by propping it up from below
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2. act as support for: to act as a support or foundation for something
(
often passive
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 the hard facts that underpin these assumptions
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