weak link

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weak link

Someone or something considered inferior to the other parts of a group, series, or mechanism. The weak link in computer security is almost always the end user. Derek hardly ever comes to class, so I'm not surprised he was the weak link in our group project.
See also: link, weak

weak link (in the chain)

Fig. the weak point or person in a system or organization. Joan's hasty generalizations about the economy were definitely the weak link in her argument.
See also: link, weak

weak link

The least dependable member of a group, as in The shipping department, slow in getting out orders, is our weak link in customer service , or They're all very capable designers except for Ron, who is clearly the weak link. This expression alludes to the fragile portion of a chain, where it is most likely to break. [Mid-1800s]
See also: link, weak