1.
a method of therapy that attempts to eliminate undesired behavior by associating it repeatedly with painful or unpleasant effects
2.
therapy aimed at eliminating an irrational fear or dislike by making somebody experience the thing feared or disliked in remote or indirect ways that gradually become closer and more direct
3.
a treatment to change someone’s behaviour or get rid of a bad habit by giving them an unpleasant experience every time they behave in a particular way or do a particular thing