ἐντείνειν
From LSJ
κύματα θαρσαλέως ποντοπόρει βιότου → the waves of life make bold furrows, travel boldly over the waves of life
Greek > English (Woodhouse Verbs Reversed)
(see also ἐντείνω): bend, deal, deliver, draw, stretch, tight, tighten, exert oneself, inscribe geometrically, make an effort, make taut, set to music, strain oneself make an effort