What does quack like a duck mean?

quack like a duck

Word Rarity Rare

Frequency: Zipf frequency 3.03 in modern English

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verb

To appear to be exactly what one is.

"If it quacks like a duck, it's a duck."
"If you quack like a duck, then you must be a duck. If you are functioning like a local body, then you must be one."

quacks like a duck (present, singular) quacking like a duck (participle, present) quacked like a duck (participle, past) quacked like a duck (past)

duck typing

duck typing

How to pronounce quack like a duck

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