Howſoeuer it were, the Lacedæmonians being no leſſe wearied of the warre, than the Athenians were eagre to purſue it, the one obtained their eaſe, and the other the execution and honor which they deſired : for all the Greekes (thoſe of Peloponmeſus excepted) willingly ſubiected themſelues to the commandment of the Athenians which was both beginning of their greatneſſe in that preſent age, and of their ruine in the next ſucceeding. 1614, Walter Raleigh, The History of the World, Book III., Chapter VII., page #66:
Not attested in Middle English; either from Old English *ēagor (“water, sea”) (attested in ēagorstrēam) or Old Norse ægir (“sea, ocean”); however, both possibilities fail to show the phonological outcome one would expect.
Meanings
a tidal bore
A large wave like an eagre, diverging from its bow, was extending to either bank, swamping the tules and threatening to submerge the lower levees. 1896, Bret Harte, In a Hollow of the Hills: and Other Tales, page 210: