weak link

Since measles is so contagious, even with herd immunity, it can find a weak link and spread.

And then there is Alex McCord, until now the show's conspicuous weak link.

The weak link in the chain of evidence against Lady Eileen Meredith was the lack of motive.

He may deny it if his conviction hangs upon that point Mr. McCausland wishes to leave no weak link in the chain.

"Well, then there is one weak link we have got to strengthen right away," said the lad cheerfully.

Here, then, was the weak link in Ruiz Gregorio's chain twisted to the breaking point at the very outset.

Every man taught how a weak link may break a chain and realizing himself as a link and only a link!