Definitions of stab:

• noun:   a thrusting blow with a knife or other sharp pointed instrument

  Example: "One strong stab to the heart killed him"

• noun:   informal words for any attempt or effort

  Example: "He took a stab at forecasting"

• noun:   a sudden sharp feeling

  Example: "She felt a stab of excitement"

• verb:   stab or pierce
• verb:   use a knife on
• verb:   poke or thrust abruptly