verb (used without object), dapped, dapping.
to fish by letting the bait fall lightly on the water.
to dip lightly or suddenly into water: The bird dapped for the fish.
to bounce or skip, as on the surface of a body of water: The stone dapped along the surface of the pond.
verb (used with object), dapped, dapping.
to cause to dip in and out of water: to dap one's bait.
to cause to skip along the surface of water: to dap stones across the river.
Carpentry. to notch (a timber) to receive part of another timber.
Carpentry. a notch in a timber for receiving part of another timber.

1575–85; probably variant of dab1

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World English Dictionary
dap1 (dæp)
vb , daps, dapping, dapped
1.  angling to fish with a natural or artificial fly on a floss silk line so that the wind makes the fly bob on and off the surface of the water
2.  (intr) (as of a bird) to dip lightly into water
3.  to bounce or cause to bounce
[C17: of imitative origin]

dap2 (dæp)
dialect (Southwest English) another word for plimsoll
[C20: probably special use of dap1 (in the sense: to bounce, skip)]

abbreviation for
distributed array processor

Collins English Dictionary - Complete & Unabridged 10th Edition
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Dictionary.com's 21st Century Lexicon
Main Entry:  dap
Part of Speech:  n
Definition:  a knuckle-to-knuckle fist bump performed as a sign of friendship, celebration, or agreement
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Word Origin & History

fist-bump greeting, with various theories as to origin and name meaning. In U.S. popular black culture by 1972 and controversial during the Vietnam War when used by U.S. soldiers, as it often was regarded by whites as a ritual act of black solidarity. Probably onomatopoeic (dap was used in 19c. for the
bounce of a ball or the skip of a stone on water). Dap, meanwhile, is listed in the DAS as black slang c.1950 for "aware, up to date," also "stylish, well-dressed," in the latter case at least a shortening of dapper.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
  1. Data Access Protocol

  2. Diagnostic Accreditation Program

The American Heritage® Abbreviations Dictionary, Third Edition
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Published by Houghton Mifflin Company. All rights reserved.
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