What is another meaning for knocking?

In many card and token games a player is required to knock the table when he's down to one token/card The player so doing is said to be 'knocking' A gasoline motor is said to be 'knocking' when the air/gas mix is too lean Knocking can also be criticising, using a knocker of a door, declaring an auction over Knocking off: finishing work for a break, or the day: making a hasty job of: robbing Knocking up: waking: making pregnant: making hasty job of Knocking over: robbing Knocking down: to assault and to beat to the ground