knock (something) on the head
phrase
British, informal
: to cause the end or failure of (something)
The closing of the airport knocked our holiday plans on the head.
Cite this Entry
“Knock (something) on the head.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/knock%20%28something%29%20on%20the%20head. Accessed 12 Mar. 2026.
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Merriam-Webster unabridged
