to open one's mouth; to start to talk; to speak out or make a request

an aperture, hole, or gap in a surface or structure

to split open; to tear; to develop a crack (e.g. in shoes or clothing)

to sharpen the edge of a tool; to put an edge on a new knife or blade

to eat or consume food; (archaic) to feed individuals

to open a channel or breach a dam for water