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to tease; to irritate; to tantalize; to keep (someone) in suspense
彼氏はわざと私を焦らした。
My boyfriend deliberately teased me.
司会者は勝者を焦らしてばかりだ。
The host just kept everyone in suspense.
小説家は次の章で読者を焦らすのが得意だ。
The novelist is good at keeping readers in suspense between chapters.