be another thing

(redirected from that's another thing)

be another thing

To be a separate and very different situation, topic, idea, etc., that has a whole other set of difficulties or problems to consider or contend with. It's all well and good wanting to help your fellow man, but inviting strangers off the street to come live with us is another thing entirely!
See also: another, thing
References in classic literature ?
that's another thing," said D'Artagnan, "and I should not mind waiting in London a whole year for a chance of meeting this Mordaunt in question.
So that's another thing I think that's relevant to this audience.
Salma speaks better English, so that's another thing she likes to torment Penelope with.