weakest link

noun

the weakest link
the person who is making the least contribution to the collective achievement of the group

C20: from the British television quiz of the same name

As sinister and well-resourced as it is, it may be the weakest link in the chain.

The judge replied: “So the whole system is as strong as its weakest link?”

Somehow, that story about the struggle had struck him as the weakest link in George's whole story.

The chain is only as strong as the weakest link, you know, fellows.

It was fully dark when I had finished, and, thinking ever on my plan, would strive afresh to weld its weakest link.

The strength of a chain lies in its weakest link, and the measure of mans strength is that of the weak point in his constitution.

The case against Penreath struck me as resembling a chain, which is no stronger than its weakest link.

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