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to tease; to make fun of; to poke fun at; to make a crack about; to chaff; to kid; to joke; to banter; to pull someone's leg
彼は友達をからかうのが好きな性格だ。
He has a personality that likes to tease friends.
兄はいつも妹をからかって怒らせている。
My brother always teases my sister and makes her angry.
からかうのはやめて、真面目に話そう。
Stop teasing and let's talk seriously.