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Inf. deliberate, but meant to look like an accident. Then, I accidentally-on-purpose spilled water on him.
intentionally; in a way that is meant or intended; not an accident. The bully stepped on my foot on purpose. Jealously, Jimmy destroyed Billy's sand castle on purpose.
intentionally The idiot who set the fire on purpose is in jail, but that doesn't help the families who lost their homes.
accidentally on purpose(humorous)
if you do something accidentally on purpose, you intend to do it but you pretend that it was an accident If I, accidentally on purpose, forget to bring her address with us, we won't be able to visit her after all.
1. Deliberately, intentionally, as in He left the photo out of the story on purpose. Shakespeare's use of this idiom was among the earliest; it appears in The Comedy of Errors (4:3): "On purpose shut the doors against his way."
2. accidentally on purpose. Seemingly accidentally but actually deliberately, as in She stepped on his foot accidentally on purpose. This generally jocular phrase was first recorded in 1862.
mod. deliberate, but meant to look like an accident. Then I accidentally-on-purpose spilled water on him.