move in for the kill
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move in for the killalso go (in) for the kill
to prepare to defeat someone completely in an argument or competition when they are already in a weak position After two days of constant media coverage, journalists sensed the minister was weakening and they moved in for the kill. At 6-3 6-2 up, Sampras went in for the kill and won the final set 6-0.See run out the clock