A confusing conjunction of "defrost" and "thaw". Has a corresponding etymology to unthaw. Literally it means to refreeze, however, it has never actually been used correctly in conversation. Ever. In fact, it is always used to mean the opposite- a synonym for thaw. Just say thaw, not dethaw, not unthaw, just thaw.
You have to dethaw the turkey in the microwave before putting it in the oven.
by Chuckahaid March 23, 2005