to the letter
The phrase "to the letter" typically means to follow instructions or rules strictly and precisely without any deviation or variation. It implies that every detail or requirement should be executed exactly as stated, without any modifications or improvisations.
English is confusing! Why do people say "Pardon my French" when they are speaking English? Because of idioms!
An idiom is a phrase or expression that usually presents a figurative, non-literal meaning attached to the phrase. Does that sound fun? It can be!
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