"fruit of the wild apple tree," a small and tart variety of apple, c. 1300 (mid-13c. in place-names), crabbe, perhaps from Scandinavian words (compare Swedish krabbäpple) which are of obscure origin. As "walking stick made of crab wood" by 1740. Crab-tree is from early 15c. Crab-apple for "fruit of the wild apple tree" is by 1712.
mid-15c., from Latin ingressus "an advance; walking; an entry," from ingress-, past participle stem of ingredi "to step into, enter," from in- "in" (from PIE root *en "in") + gradi "to step, go" (from PIE root *ghredh- "to walk, go"). The verb meaning "to enter, go in" sometimes said to be American English, but it is attested from early 14c.
"prologue, preface, preliminary statement," late 14c., from Old French preambule (13c.) and directly from Medieval Latin preambulum, neuter adjective used as a noun, properly "preliminary," from Late Latin praeambulus "walking before," from Latin prae "before" (see pre-) + ambulare "to walk" (see amble (v.)). Especially the introductory paragraph of a statute or resolution, stating the reason for and intent of what follows. Related: Preambulary.
c. 1300, "metal bar bent at the ends for fastening," from Old French crampoun "cramp, brace, staple" (13c.), from Germanic (see cramp (n.1); also compare cramp (n.2)). As "apparatus used in the raising of heavy weights," mid-15c. By 1789 as "plate set with spikes, fastened to the foot to assist in walking on ice or climbing rock."
1793, "a walker, one who walks or journeys on foot," from pedestrian (adj.). In early use especially "one who walks or races on foot for a wager; a professional walker; one who has made a notable record for speed or endurance." In 20c. it came to mean especially "person walking on a road or pavement" as opposed to person driving or riding in a motor vehicle.
1942, apparently first attested in the Walt Disney movie "Bambi" (there also was a song by that name but it was not in the studio release of the film), a past-participle adjective formed from twitter in the "tremulous excitement" noun sense (1670s) + pate (n.2) "head" (compare flutterpated, 1894).
Thumper: Why are they acting that way?
Friend Owl: Why, don't you know? They're twitterpated.
Flower, Bambi, Thumper: Twitterpated?
Friend Owl: Yes. Nearly everybody gets twitterpated in the springtime. For example: You're walking along, minding your own business. You're looking neither to the left, nor to the right, when all of a sudden you run smack into a pretty face. Woo-woo! You begin to get weak in the knees. Your head's in a whirl. And then you feel light as a feather, and before you know it, you're walking on air. And then you know what? You're knocked for a loop, and you completely lose your head!
Thumper: Gosh, that's awful.