フルストップMeanings1nounfull stop; periodA punctuation mark (.) used at the end of a sentence. The loanword フルストップ is less common than ピリオド in everyday Japanese.See also: ピリオド英えい文ぶんでは、文ぶんの終おわりにフルストップを打うつ。In English writing, you put a full stop at the end of a sentence.