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Definitions
Examples

(noun): The rear of the body, especially the part between the neck and the end of the spine and opposite the chest and belly.
(noun): That which is farthest away from the front.
(noun): Upper part of a natural object which is considered to resemble an animal's back.
(noun): A support or resource in reserve.
(noun): The keel and keelson of a ship.
(noun): The roof of a horizontal underground passage.
(noun): Effort, usually physical.
(noun): A non-alcoholic drink (often water or a soft drink), to go with hard liquor or a cocktail.
(noun): Among leather dealers, one of the thickest and stoutest tanned hides.
(verb): To go in the reverse direction.
(verb): To support.
(verb): (of the wind) To change direction contrary to the normal pattern; that is, to shift anticlockwise in the northern hemisphere, or clockwise in the southern hemisphere.
(verb): (of a square sail) To brace the yards so that the wind presses on the front of the sail, to slow the ship.
(verb): (of an anchor) To lay out a second, smaller anchor to provide additional holding power.
(verb): (of a hunting dog) To stand still behind another dog which has pointed.
(verb): To push or force backwards.
(verb): To get upon the back of; to mount.
(verb): To place or seat upon the back.
(verb): To make a back for; to furnish with a back.
(verb): To adjoin behind; to be at the back of.
(verb): To write upon the back of, possibly as an endorsement.
(verb): (of a justice of the peace) To sign or endorse (a warrant, issued in another county, to apprehend an offender).
(verb): To row backward with (oars).
(adjective): Near the rear.
(adjective): Not current.
(adjective): Far from the main area.
(adjective): In arrear; overdue.
(adjective): Moving or operating backward.
(adjective): Pronounced with the highest part of the body of the tongue toward the back of the mouth, near the soft palate (most often describing a vowel).
(adverb): To or in a previous condition or place.
(adverb): Away from the front or from an edge.
(adverb): In a manner that impedes.
(adverb): In a reciprocal manner; in return.
(adverb): Earlier, ago.

Could you please scratch my back?
He sat in the back of the room.
The small boat raced over the backs of the waves.
The ship's back broke in the pounding surf.
Put some back into it!