pin sth up

— Phrasal Verb with pin

/pɪn/ verb [T] (present participle pinning, past tense and past participle pinned)

Definition

› to fasten something to a wall using a pin: The exam results have been pinned up on the noticeboard.

(Definition of pin sth up from the Cambridge Learner's Dictionary © Cambridge University Press)

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

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