a different kettle of fish
idiomPart ofdifferent
a different kettle of fish — idiom
1. Refers to a situation or person that is completely different from what was previ
1.idiom
Definition
Refers to a situation or person that is completely different from what was previously discussed.
Example
Living with a roommate is one thing; living with your in-laws is a different kettle of fish.
I can handle small dogs, but a Great Dane is a different kettle of fish.