θαλασσοκρατεῖν

From LSJ

οὔποτε ποιήσεις τὸν καρκίνον ὀρθὰ βαδίζειν → thou shalt never make the crab walk straight

Source

Greek > English (Woodhouse Verbs Reversed)

(see also: θαλασσοκρατέω) be supreme at sea, command the sea

Lexicon Thucydideum

maris imperium tenere, to rule the sea, 7.48.2, 8.30.2, 8.41.1.