From The Phrontistery:

Yare yair, adj (Old English gearu or gearo, ready, prompt)

Marked by quickness and agility; nimble; prepared; easily handled. It's basically obsolete anymore, but this fantastic short little gem is very useful. It reflects the sense of preparedness and mental quickness one feels from time to time - the feeling that one is ready to face the world and its challenges, and that anything is possible.

River Yare at Earlham Park, Norfolk, England