That’s settled it

[Tamara]

Hi

That’s settled it.
Well, that settles it then!

Am I right supposing that the expression ('settle it') is colloquial and can be used only informally?
(Even though the first sentence is taken from a novel and not from a dialogue. )
_________________
It’s impossible to learn swimming without entering the water…

[Yankee]

Hi Tamara

I'll agree that certain sentences using "settle it" would be more informal (or colloquial) than others, but I don't see any reason why "settle it" couldn't also be used in more formal speech/writing.

Amy
_________________
Amy
.
ESL teacher, translator, and a native speaker of American English

[Alan]

Hi Tamara,

That's settled it can often hint at a note of despair when used colloquially. It has the sense of the final straw. There is another expression : That's put the tin lid on it! These expressions are often used when you have reached the end of your tether.

Having said all that I should add that it can be used formally to indicate arrange satisfactorily. In arguments on whatever scale domestic or high politics people can: settle their differences/world leaders can settle their differences - wouldn't it be great if they did?

Alan
_________________
English as a Second Language
You can read my ESL story In Order

[Tamara]

Hi
Thanks a lot for your responses.