I. ˈī-siŋ noun
Date: circa 1740
1. : a sweet flavored usually creamy mixture used to coat baked goods (as cupcakes) — called also frosting
2. : something that adds to the interest, value, or appeal of an item or event — often used in the phrase icing on the cake
II. noun
Date: 1948
: an illegal act by an ice-hockey player of shooting a puck from within the defensive zone or defensive half of the rink beyond the opponents' goal line but not into the goal