knock (something) on the head

idiom

Definition of knock (something) on the head

British, informal
: to cause the end or failure of (something) The closing of the airport knocked our holiday plans on the head.

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“Knock (something) on the head.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/knock%20(something)%20on%20the%20head. Accessed 10 December 2019.

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