[Belongs to BUMP v.1 Onomatopœic: the vb. and sb. of action being probably coeval. App. the order was bump v. to knock, and bump sb. a knock; hence as sb. a swelling protuberance caused by a blow, and as vb. to swell or rise in a protuberance; but the historical record is not very complete. Cf. BOUNCE, THUMP, etc. Also as a parallel instance of an onomatopœia combining the two senses ‘sudden blow’ and ‘swelling’ cf. BUNCH.]

1

  I.  1. A blow somewhat heavy, but rather dull in sound; a sudden collision, more or less violent.

2

1611.  Cotgr., Adot, a blow, bumpe, or thumpe.

3

1768–78.  Tucker, Lt. Nat., II. 149. An unlucky bump upon the head [might have] rendered him stupid.

4

1862.  Smiles, Engineers, III. 10. When the pump descends, there is heard a plunge, a heavy sigh, and a loud bump.

5

1882.  Lett., in Royal Acad. Catal. (1883), 95. It went into the ditch with a bump.

6

  2.  Boating. The impact of the stem of a boat against the stern or side of another boat in front of it: in boat-racing at the English Universities, the making of a ‘bump’ is the technical proof of one boat’s overtaking and beating another.

7

1861.  Hughes, Tom Brown at Oxf., I. xiv. 282. A bump now and no mistake; the bow of the St. Ambrose boat jams the oar of the Oriel stroke.

8

1884.  Sat. Rev., College Life, 12 July, 47/1. An unexpected bump in May.

9

  II.  Swelling.

10

  3.  A protuberance such as is caused by a blow or collision; a swelling, an irregular prominence.

11

1592.  Shaks., Rom. & Jul., I. iii. 53. It had upon it brow, a bumpe as big as a young Cockrels stone; a perilous knock.

12

1611.  Cotgr., Angonailles, botches, (pockie) bumps or sores. Ibid., Bigne, a bumpe, knob, rising, or swelling after a knocke.

13

1693.  Dryden, Juvenal, XVI. 14 (J.).

        Not tho his Teeth are beaten out, his Eyes
Hang by a String, in Bumps his Fore-head rise.

14

1825–7.  Hone, Every-day Bk., II. 1016. I sat upon a small knoll, surrounded by curves and bumps.

15

  4.  transf. One of the prominences on the cranium associated by phrenologists with special mental faculties and propensities; sometimes used for the faculties, etc., themselves. (colloq.)

16

1815.  Edin. Rev., XXV. 251. The aforesaid bumps on the head are … signs of peculiar energy, in some of the special faculties.

17

1863.  Kingsley, Water-bab., iv. 165. She felt his bumps, and cast his nativity.

18

Mod.  I never knew anyone so deficient in the bump of locality.

19

  III.  Comb., as bump-stick, a tool used by shoemakers for smoothing soles (= Sleek-stick); bump-supper, a supper given to celebrate the making of a ‘bump’ by a college boat (see 2).

20

1725.  Bradley, Fam. Dict., s.v. Box, It [Boxwood] makes also … Bump-Sticks and Dressers for Shoemakers.

21