Discussion

a completely different matter in comparison to what one used to deal with

I thought I was going to a boring lecture, but the professor's teaching style was a horse of a different color.She used interactive games and group activities to keep us engaged.

an obvious issue, problem, or matter that people purposely ignore

The student's plagiarism was the elephant in the room in the classroom, but the teacher didn't want to embarrass the student in front of the class.

an issue or subject that is not in any way connected to what one was talking about

Managing a large team of employees is a different kettle of fish from managing a small team.

a type of activity, subject, etc. that one is very good at or enjoys very much

Classical music is just not my cup of tea.

(of a process or action) to have two opposite effects, particularly a good and a bad one

His decision to reduce expenses cut both ways; it saved money but also resulted in staff layoffs.

a person who pretends to disagree with an opinion or idea just to promote a discussion concerning a particular subject

I know everyone thinks we should support the new zoning proposal, but I'm going to play devil's advocate and say that I think it will have some negative consequences.

used to state one's indifference to the way a situation develops or what its result will be

He can take the bus or the train, it makes no odds to him as long as he gets there on time.

a reasoning or explanation that is deemed sufficient to justify or defend someone's actions

The company's claims that the product is safe have no leg to stand on in light of the recent recall.