a high tidal wave
in an estuary; bore
Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by
Houghton Mifflin Harcourt. All rights reserved.
Word origin of 'eagre'Brit dial. form, prob. ult. < OE eagor, flood, high tide, akin to ON ægir, ocean < IE *ēkw-, var. of base *akwa-, water > L aqua