I. ˌfull ˈstop 1 BrE AmE noun
[countable] British English a point (.) that marks the end of a sentence or the short form of a word SYN period American English :
Put a full stop at the end of the sentence.
II. full stop 2 BrE AmE interjection British English informal
used at the end of a sentence to emphasize that you do not want to say any more about a subject SYN period American English :
I don’t have a reason. I just don’t want to go, full stop.