fine as frog's hair
The phrase "fine as frog's hair" is an idiomatic expression that means something is excellent, exceptionally good, or of the highest quality. The comparison to a frog's hair is used to emphasize how rare and fine it must be since frogs do not have visible hair.
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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