"a stupid head," 1530s; later also "a big, clumsy, stupid person." The origin and signification of jolt here is unknown.

"this," as in yay big "this big," 1950s, perhaps from yea "yes" in its sense of "even, truly, verily." "a sort of demonstrative adverb used with adjectives of size, height, extent, etc., and often accompanied by a hand gesture indicating size" [DAS].

"Rocky Mountain sheep," 1805, American English (Lewis & Clark), from big + horn (n.).

"largeness of proportions; size, whether large or small; bulk, absolute or relative," late 15c., from big + -ness.

also wing-tip, 1867, "tip of a wing" (originally of insects; by 1870 of birds), from wing (n.) + tip (n.1). Of airplane wings from 1909. As a type of shoe with a back-curving toe cap suggestive of a bird's wingtip, from 1928. Related: Wing-tipped.

1590s, from Spanish grande "nobleman of the first rank," originally an adjective, "great," from Latin grandis "big, great" (see grand (adj.)).

1910, originally theater slang for lower-salaried circuits, or ones requiring more daily performances; from noun phrase (also 1910). Compare big time.

"very small hole where mice go in and out, a hole only big enough to admit a mouse," early 15c., from mouse (n.) + hole (n.).

final letter of the Greek alphabet, c. 1400, from Medieval Greek omega, from classical Greek o mega "big 'o' " (in contrast to o micron "little 'o' "); so called because the vowel was long in ancient Greek. From o + megas "great, large, vast, big, high, tall; mighty, important" (from PIE root *meg- "great"). Used figuratively for "the last, the final" of anything (as in Revelation i.8) from 1520s.

"walking on the toes with the heel raised from the ground" (opposed to plantigrade), by 1819, from Modern Latin digitigradus, from digitus "toe" (see digit) + gradi "to walk, go, step" (from PIE root *ghredh- "to walk, go"). As a noun, "a digitigrade mammal," by 1802.