tip-up adj 1: constructed so as to tip up or out of the way; "the little tip-up seat of the taxi"
Tip-up \Tip"-up`\, n. (Zool.) The spotted sandpiper; -- called also {teeter-tail}. See under {Sandpiper}. [1913 Webster]
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. [WordNet 1.5]