Origin of pull-oneself-up-by-one-s-bootstraps
Early 19th century US; attested 1834. In original use, often used to refer to pulling oneself over a fence, and implying that someone is attempting or has claimed some ludicrously far-fetched or impossible task. Presumably a variant on a traditional tall tale, as elaborated below. The shift in sense to a possible task appears to have developed in the early 20th century, and the use of the phrase to mean “a ludicrous task” continued into the 1920s.