pin down

Definition

To attach or secure with pins.

Example Sentences

• "Pin down the tablecloth, so it doesn't blow away in the breeze."
• "There are approximately 1,000 places on British Railways where wagon brakes must be pinned down before trains proceed over severe falling gradients; the trains have to be brought to a stand for the brakes to be pinned down, and subsequently have again to be stopped for the brakes to be released."
• "Something is wrong, but I can't pin it down."

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