Sir: "Dap" can also refer to the speed at which a person or object travels - "He went at a good dap". I have never heard it used of dropping crockery, which does not mean that R Pugh (letter, 18 March) is wrong, but I never use "drop" in that context. The correct word is "fall", as in "You mind you don't fall our Mam's best cup when you do do (sic) the dishes." The dialects of South Wales vary greatly over even very short distances.
The Very Rev JOHN ROGERS