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Related to tell tales: tell tales out of school
To share secrets, often knowing that doing so will cause problems for someone else. Here's a tip: don't tell tales about your co-workers if you want to have any friends here.
Divulge secrets, as in Don't trust him; he's apt to tell tales. This expression was first recorded about 1350. A variant, tell tales out of school, first recorded in 1530, presumably alluded to schoolchildren gossiping but was soon broadened to revealing secret or private information. Both may be obsolescent.
If someone tells tales, they tell someone in authority about something bad or wrong that someone else has done. She had no right to tell tales to his mother! They try to get convicted criminals to tell tales on their mates in return for cuts in their own sentences. Note: This expression is used to show disapproval.
tell tales (out of school)gossip about or reveal another person's secrets, wrong-doings, or faults.
As telling tales to school authorities is a terrible offence in the eyes of schoolchildren, this expression is often used in the context of declining to supply information or gossip.
1991 Mark Tully No Full Stops in India Indira trusted me throughout her life, and just because she's dead it's not right that I should break that trust and tell tales about her.