1. To reveal the plans or activities of another, especially ones that are secret or improper: tattled on his sister when she snuck out; tattled to his parents about what his sister did.
2. To chatter; prate.
v.tr.
To reveal (something about someone) to another, as through gossiping.
n.
1. Idle talk; chatter; prattle.
2. A tattletale.
[Middle English tatelen, to stammer, probably from Middle Dutch, of imitative origin.]
disclose, let on, divulge, expose, give away, let out, reveal, unwrap, discover, bring out, break - make known to the public information that was previously known only to a few people or that was meant to be kept a secret; "The auction house would not disclose the price at which the van Gogh had sold"; "The actress won't reveal how old she is"; "bring out the truth"; "he broke the news to her"; "unwrap the evidence in the murder case"
talk, spill - reveal information; "If you don't oblige me, I'll talk!"; "The former employee spilled all the details"
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