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    overrun

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    overrun
    I
    o‧ver‧run1 /ˌəʊvəˈrʌn $ ˌoʊ-/ verb (past tense overran /-ˈræn/, past participle overrun, present participle overrunning)
     Word Family: noun: run, rerun, runner, running, overrun; verb: run, outrun, overrun, rerun; adjective: running, runny; adverb: running
    1. [transitive usually passive] if unwanted things or people overrun a place, they spread over it in great numbers
        be overrun by/with something
        a tiny island overrun by tourists
        The house was overrun with mice.
    2. [intransitive and transitive] to take more time or money than intended:
        The final speaker overran by at least half an hour.
    3. [transitive usually passive] if soldiers overrun a place, they take control of it:
        Poland was overrun by the Russian army.

    II
    o‧ver‧run2 /ˈəʊvərʌn $ ˈoʊ-/ noun [countable]
     Word Family: noun: run, rerun, runner, running, overrun; verb: run, outrun, overrun, rerun; adjective: running, runny; adverb: running
    an amount of time or money that is larger than was planned or intended:
        cost overruns of £2 billion