One’s entire body; totally. The earliest of these slightly varied expressions is
from head to foot, which Homer used in the
Iliad, Aristophanes in
Plutus, Plautus in several plays, and many others after them. Shakespeare used
from top to toe in
Hamlet (1.2). The alliterative
head to heels, dating from about 1400, was favored by the English poet William Cowper (
Anti-Thelypthora, 1781): “So polished and compact from head to heel.” See also
stem to stern.