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1 : the condition of being safe from undergoing or causing hurt, injury, or loss
2 : a device (as on a weapon or a machine) designed to prevent inadvertent or hazardous operation
3a(1) : a situation in football in which a member of the offensive team is tackled behind its own goal line that counts two points for the defensive team — compare touchback
(2) : a member of a defensive backfield in football who occupies the deepest position in order to receive a kick, defend against a forward pass, or stop a ballcarrier
b : a billiard shot made with no attempt to score or so as to leave the balls in an unfavorable position for the opponent
: to protect against failure, breakage, or accident safety a rifle