Longman Dictionary of Contemporary English homepage

missing link

 noun
     
missing link [countable]
1 a piece of information that you need in order to solve a problem:
Could this be the missing link in the search for a cure for cancer?
2

the missing link

SA an animal which was a stage in the development of humans from apes, whose bones have not yet been found
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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