I am not sure I have ever seen ‘peach’ used as a verb before. The verb ‘impeach’ is fairly common, we all are familiar with the fuzzy fruit, and I have been asked to ‘be a peach’ but have never considered using the word as a verb.
And if the authorities caught you returning from transportation—if an old enemy, or an old friend with a score to settle, saw you and peached on you—then you were hanged without a blink.
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Peach:
v. peached, peach·ing, peach·es
- To inform on someone; turn informer: “Middle-level bureaucrats cravenly peach on their bosses [when] one of them does something the tiniest bit illegal” (National Observer).
- To inform against: “He has peached me and all the others, to save his life” (Daniel Defoe).
[Middle English pechen, from apechen, to accuse (probably from Anglo-Norman *anpecher, from Late Latin impedic

So, be a peach, and don’t go peaching on me.
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