Anabasis	A military advance	A military retreat
Anxious	Full of mental distress because of apprehension of danger or misfortune [in effect, seeking to avoid] (We were anxious about the nearby gunshots.)	Eager or looking forward to (Until you returned, I was anxious to see you.)
Apparent	Not clear or certain (For now, he is the apparent winner of the contest.)	Obvious (The solution to the problem was apparent to all.)
Avocation	a hobby	a regular occupation [and one could say it's a triple autoantonym if you agree that the archaic meaning of "a distraction" is the opposite of working (even at a hobby) and if you agree that the obsolete meaning of "a calling away" takes you away from (the opposite of participating in) your hobbies, work, and even your distractions!]
Awful	Extremely unpleasant, ugly	Awe-inspiring [typically, a feeling of admiration]
Cite, Citation	For doing good (such as military gallantry)	for doing bad (such as from a traffic policeman)
Cleave	To adhere tightly	To cut apart
Dust	To remove dust	To apply dust (as in fingerprinting)
Enjoin	To order someone to do something	To stop someone from doing something [such as in law by an injunction]
Fearful	Causing fear	Being afraid
Hysterical	Being overwhelmed with fear [in some cases]	Being funny
Inflammable [a pseudo-autoantonym!]	Burns easily	[the incorrect assumption by many that the prefix in- makes it mean:] Does not burn [Only the first definition is correct; the risk of confusion has removed this word from gasoline trucks!]
Lease, Let, Rent	[in essence] To loan out for money	To "borrow" for money
Let	[Archaic] To hinder	To allow
License	Liberty or permission to do something	Undue or excessive freedom or liberty
Moot	[a slight stretch here] A moot point is one that is debatable, yet is also of no significance or has been previously decided, so why debate it?
Oversight	Watchful and responsible care	An omission or error due to carelessness
Practiced	Experienced, expert (I am practiced in my work)	Inexperienced effort (The child practiced coloring)
Prescribe	To lay down a rule	To become unenforceable
Riot	Violent disorder	Revelry
Sanction	Support for an action (They sanctioned our efforts.)	A penalty for an action (The Congressman was sanctioned for inappropriate behavior.)
Sanguine	(Now poetic) Causing or delighting in bloodshed [according to contributor, also describes a person worked up into a bloody rage]	A person hopeful or confident of success [essentially someone calm about something]
Secreted	Having put out, released	Placed out of sight
Shank	(Informal) The early part of a period of time (It was just the shank of the evening when the party began.)	(Informal) The latter part of a period of time (It was the shank of the evening when the party ended.)
Skin	to cover with a skin	to remove outer covering or skin
Strike out	An ending, as in "The batter struck out."	A beginning, as in "I thought it was time to strike out on my own."
Terrific	(Informal) Extraordinarily good	Causing terror