open a crack

idiom

Definition of open a crack

: to open (something, such as a door or window) slightly Could you please open the window a crack? It's getting hot in here.

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“Open a crack.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/open%20a%20crack. Accessed 19 Sep. 2020.

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