喜新厭舊 [ㄒㄧˇ ㄒㄧㄣ ㄧㄢˋ ㄐㄧㄡˋ; xi3 xin1 yan4 jiu4] lit. to like the new, and hate the old (idiom); fig. enamored with new people (e.g. new girlfriend), bored with the old ◄ ►
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