Английский Этимологический словарь - blow (v.)

- "move air," O.E. blawan "make an air current, sound a wind instrument" (class VII strong verb; past tense bleow, pp. blawen), from P.Gmc. *blж-anan, from PIE *bhle- "to swell, blow up." Slang fellatio sense is from 1930s. Meaning "to spend (money) foolishly and all at once" is 1890s. Blowhard (n.) "braggart" is from 1820s; blowout "big, loud party" is also 1820s. To blow up is from 1599.