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lower (one's) sights
To lower one's expectations and accept less than one was hoping for or striving toward. Unfortunately, we simply can't afford to live in that ritzy neighborhood, so we have to lower our sights and look elsewhere.
lower one's sights
Fig. to set one's goals lower. (Alludes to pointing the barrel of a rifle lower to lower the aim of the rifle.) Even though you get frustrated, don't lower your sights. I shouldn't lower my sights. If I work hard, I can do what I want.