“ The grass is always greener on the other side (of the fence)”
something that you say which means that other people always seem to be in a better situation than you, although they may not be
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Example : Jill: My job is so tedious. I wish I had my own business, like Beatrice does. Jane: Beatrice probably wishes she had the security of her old job. The grass is always greener on the other side of the fence.