switchsthon
—phrasal verbwithswitchverb[T,Iusually+ adv/prep]uk/swɪtʃ/us/swɪtʃ/
usuallydisapprovingIf someoneswitcheson aparticularemotionorbehaviour, theysuddenlystarttofeelorbehavein that way, but usually notsincerely.
（通常不是发自内心地）突然变得，突然装出
When acustomerwalksin, sheswitcheson thecharm.一有顾客走进来，她就马上装出亲切可人的样子。