Word Origin & History
bob"short hair," 1680s, attested 1570s in sense of "a horse's tail cut short," from earlier bobbe "cluster" (as of leaves), mid-14c., a northern word, perhaps of Celtic origin (cf. Ir. baban "tassel, cluster," Gael. babag). Used over the years in various senses connected by the notion of "round, hanging
EXPANDmass," e.g. the meaning "weight at the end of a line" (1650s). The hair sense was revived with a shift in women's styles early 20c. (verb 1918, noun 1926). Related words include bobby pin, bobby socks, bobsled.
COLLAPSE