not on
idiom
British, informal
1
: not acceptable or proper
Cheating old ladies out of their savings just isn't on.
2
: not possible
I'm afraid that scheme's just not on.
Dictionary Entries Near not on
Cite this Entry
“Not on.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/not%20on. Accessed 29 Nov. 2024.
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