dap
Concise Oxford English Dictionary © 2008 Oxford University Press:
dap/dap/
▶verb (daps, dapping, dapped) fish by letting the fly (but not the line) bob lightly on the water. ▶noun
- 1 a fishing fly used in this way.
- 2 dialect a rubber-soled shoe.
– origin C17: symbolic of a flicking movement.
'dap' also found in these Oxford entries:

