One who opposes another; one who works or takes a position against someone or something; one who attempts to stop the progress of someone or something.
The participant who opens an academic debate by putting forward objections to a theological or philosophical thesis.
One who opposes another in words (in a dispute, argument or controversy).
One who is opposed or objects (to a policy, course of action or set of ideas).
One who opposes another physically (in a fight, sport, game, or competition).
A person serving as an object of abuse.
A tough bag, usually cylindrical, filled with air, sand, or other material, often suspended so that it swings freely, which is punched or kicked when practising sports such as boxing or martial arts.