DCHP-1 Online
tip-up 
n. in ice-fishing, a device for supporting a line and indicating when a fish is hooked, as a pole balanced on a fulcrum so that one end, which often has a flag attached, is raised upright when a fish pulls on the line. [See picture at tip-up.]
- 1923 Fishing through the ice . . . With the aid of what they call "tip-upses" several lines can be used simultaneously.
- 1923 Fishing through the ice . . . With the aid of what they call "tip-upses" several lines can be used simultaneously.