that would be telling

That would give away the secret or surprise. A: "Does this mean that we're getting a puppy after all?" B: "Now, now, that would be telling. Just have patience!"

that would be telling

that would be divulging confidential information. informal

2000 Imogen Edwards-Jones My Canapé Hell ‘Are you propositioning me?’ I say, attempting to look provocative in my Devonshire home-knit and Angora Dutch cap. ‘Now that would be telling,’ he smiles.

See also: telling, that

Farlex Partner Idioms Dictionary © Farlex 2017

See also:

there's no telling
you're telling me
You're telling me!
of the sort
pick of the bunch
the pick of the bunch
of your choice
of (one's) choice
of choice
break the Internet

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