Definitions of curse:

• noun:   profane or obscene expression usually of surprise or anger
• noun:   a severe affliction
• noun:   something causes misery or death
• noun:   an evil spell

  Example: "A witch put a curse on his whole family"

• noun:   an appeal to some supernatural power to inflict evil on someone or some group
• verb:   utter obscenities or profanities
• verb:   wish harm upon; invoke evil upon

  Example: "The bad witch cursed the child"

• verb:   heap obscenities upon

  Example: "The taxi driver who felt he didn't get a high enough tip cursed the passenger"

• verb:   exclude from a church or a religious community