and that's flat!
UK informalused to tell someone that the decision you have just announced will not change even if they try to persuade you to change it:
I'm not coming, and that's flat!
Thesaurus: synonyms and related words
Certainty
- (as) clear as day idiom
- (as) sure as eggs is eggs idiom
- assured
- assuredly
- be in the bag idiom
- bet
- cut and dried
- decided
- decidedly
- definite
- definitely
- doubt
- indeed
- natch
- pronounced
- proof positive
- seal
- set/put the seal on sth idiom
- shadow
- signed and sealed idiom
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