From Longman Dictionary of Contemporary Englishthe weak/weakest linkthe weak/weakest linkthe person or thing in a situation that is less strong, skilful etc than the others Goalkeeper Gouter proved to be the weakest link. → weak
Examples from the Corpus
the weak/weakest link• Below that speed it is impossible to generate sufficient lift to overload the weak link.• This boy was more the Weakest Link as he ducked out of taking two decisions to deny Leeds the win they deserved.• Anderson is the weakest link in his.• This is the weakest link in the chain, and we have a system for chasing referees and eventually going elsewhere.• This time, it was the primacy of the office as gathering place that was the weak link in the chain.• A patio door could be the weak link in your domestic security chain.• Breaking the weak link proved a bigger hazard than actual cable breaks or power failures. 