Dolour pays nae debts.
Dool and an ill life soon mak an auld wife.
"Sorrow and an evil life maketh soon an old wife."—English.
Do on the hill as ye wad do in the ha'.
Let your private character be consistent with your public one.
Do't by guess, as the blind man fell'd the dog.
Do the likeliest and hope the best.
Double charges rive cannons.
That is, surfeits are dangerous; but the proverb which follows shows, as usual, that there is no rule without an exception.
Double drinks are gude for drouth.