A variant spelling or informal term for a diaper or cloth used to wrap a baby.
A shortened or informal form of 'diaper', itself from Old French 'diapre' (patterned cloth). The 'didy' form appears in dialectal American English, particularly in Southern United States.
Language reveals how people actually talk—'didy' is exactly what you'd hear a grandparent say in the South, but it never made it into dictionaries because informal speech rarely does, even when thousands of people use it daily.
Complete word intelligence in one call. Free tier — 50 lookups/day.