κρατεῖσθαι
From LSJ
Ἐς δὲ τὰ ἔσχατα νουσήματα αἱ ἔσχαται θεραπεῖαι ἐς ἀκριβείην, κράτισται → For extreme diseases, extreme methods of cure, as to restriction, are most suitable.
Greek > English (Woodhouse Verbs Reversed)
(see also κρατέω): be conquered, be vanquished