do someone a bear's service(данный вариант приводится только для целей буквалистического перевода, когда это необходимо: This story, used by the famous poet Krylov in his rhymed fable, is so popular in Russia that the term "to do someone a bear's service" has become a part of everyday speech, much more vivid than the English "to bestow a doubtful blessing"google.com)
shoot oneself in the foot(We'll be shooting ourselves in the foot by putting a cap on immigration, which helps close the skills gap in Britain.Moscowtran)
