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weakest link

noun
  1. the weakest link British the person who is making the least contribution to the collective achievement of the group
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Word Origin

C20: from the British television quiz of the same name
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012