In some narrow straits, tides can cause currents hazardous to small boats. One name for this is "euripus", derived fronm one well know in antiquity, between Boeotia and Euboea.

pl. 3pi# 73pj#8 5L < Gr euripos < eu3 (see EU3) + rhipc, rush, impetus, orig., turning motion < IE *wrei3 < base *wer3, to turn > L vertere, Ger reiben, to grate6 a strait or channel with a violent current or tide