tip-up

Short definition from Wiktionary

Adjective

1. 1
   Designed to tilt to a vertical position when not in use, either manually or of its own accord.

Noun

1. 1
   A device used in ice fishing, having a flag that is raised to alert the angler when the bait below the ice is taken.

Verb

1. 1
   To tilt something upward in order to discharge its contents.