Meaning of “with a capital A, B, etc.” in the English Dictionary

british dictionary

"with a capital A, B, etc." in British English

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with a capital A, B, etc.

said after the name of a particular quality to say that it is very strong, using its first letter:

He's trouble with a capital T!

(Definition of “with a capital A, B, etc.” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)