that's

pron

(nonstandard, dialect, e.g. Black Country, Northern Ireland) whose, of which, in dialects that require a human antecedent for 'whose'

That's not what I meant.

意味（1）

(nonstandard, dialect, e.g. Black Country, Northern Ireland) whose, of which, in dialects that require a human antecedent for 'whose'

He had in his pocket an old flick-knife that's spring was slow and temperamental.