D
- Daft - silly
- Dag - short hatchet or axe (miner's dag); also in phrase "Face like a dag"
- Denner - dinner, evening meal
- Devoner - someone from Devon (used in a derogatory sense)
- Didikoy - gypsy (mid and east Cornwall)
- Dinas - (a place-name element) hill fort
- Dishwasher - water-wagtail
- Dobeck - somebody stupid ("great dobeck")
- Dram - swath
- Drash - thresh; "drasher" = thresher
- Dreckley / Dreckly - at some point in the future; soon, but not immediately; like "mañana", but less urgent (derives from English "directly" but differs in meaning) (c.p. Presently, British English, but formerly the meaning was "immediately")
- Dreckzel - threshold of a doorway
- Dry (china clay) - a dry is where the sludge gets processed (e.g. Wenford Dries)
- Du - (a place-name element) black
- Dummity - low light level, overcast
- Durns - door frame
Read more about this topic: List Of Cornish Dialect Words