The Collaborative International Dictionary
To tell on
Tell \Tell\, v. i.
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To give an account; to make report.
That I may publish with the voice of thankgiving, and tell of all thy wondrous works.
--Ps. xxvi. 7. -
To take effect; to produce a marked effect; as, every shot tells; every expression tells. To tell of.
To speak of; to mention; to narrate or describe.
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To inform against; to disclose some fault of.
To tell on, to inform against. [Archaic & Colloq.]
Lest they should tell on us, saying, So did David.
--1 Sam. xxvii. 11.