apostrophe

/əˈpɒstrəfi/ noun [C]

Definition

ABSENT › a mark (') used to show that letters or numbers are absent: I'm (= I am) hungry. I graduated in '98 (= 1998).

BELONGING › a punctuation mark (') used before the letter 's' to show that something belongs to someone or something: I drove my brother's car.

(Definition of apostrophe noun from the Cambridge Learner's Dictionary © Cambridge University Press)

If a reason, argument or explanation holds water, it is true

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