let the side downBritish EnglishBrEDISAPPOINTED to behave badly or do something that embarrasses or disappoints your family, friends etc 使自己人难堪，辱没自己一方let the side down• Brown was constantly letting the side down.• It is an unmentionable subject, a terrible way of letting the side down.• Essentially, it's the ageing drivetrain that lets the side down.• I don't want to let the side down - don't send me to the Sick Room!
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