Real Dictionary

heel
countable noun: The heel of a shoe is the raised part on the bottom at the back.
countable noun: Your heel is the back part of your foot, just below your ankle.

heel in American English 1
the back part of the human foot, under the ankle and behind the instep
noun: the back part of the human foot, below and behind the ankle

heel in American English 2
the act of heeling
to cause (a vessel) to heel
to lean or tilt to one side, as a ship or boat in a high wind
intransitive verb: to incline to one side; cant; tilt
noun: a heeling movement; a cant
transitive verb: to cause to lean or cant

heel in American English 3
noun: a contemptibly dishonorable or irresponsible person

heel in British English 1
noun: the back part of the human foot from the instep to the lower part of the ankle

heel in British English 2
noun: inclined position from the vertical
verb: (of a vessel) to lean over; list