If you punch someone or something, you hit them hard with your fist.
If you punch the air, you put one or both of your fists forcefully above your shoulders as a gesture of delight or victory.
If you punch something such as the buttons on a keyboard, you touch them in order to store information on a machine such as a computer or to give the machine a command to do something.
If you punch holes in something, you make holes in it by pushing or pressing it with something sharp.
A punch is a tool that you use for making holes in something.
If you say that something has punch, you mean that it has force or effectiveness.
Punch is a drink made from wine or spirits mixed with things such as sugar, lemons, and spices.
If you say that someone does not pull their punches when they are criticizing a person or thing, you mean that they say exactly what they think, even though this might upset or offend people.