What is "tip-up"

collapsible \collapsible\ adj. Capable of collapsing or being collapsed; as, a collapsible boat. [Narrower terms: telescopic; tip-up] Also See: folded. Antonym: noncollapsible.

Syn: collapsable.

adj. constructed so as to tip up or out of the way; "the little tip-up seat of the taxi"

A tip-up is a device used while ice fishing to suspend live or frozen bait at a set depth through a hole drilled in the ice with an auger, and detect when a fish strikes, without having to be in contact with this piece of gear. When a fish does take the bait, a flag "tips up" or the flag can "tip down" to signal the angler that a fish has taken his bait. Because the angler does not need to stay with his line and can see that the flag at a distance, he or she is able to cover a larger area than with just an ice fishing rod.