ἰσχύειν
From LSJ
ἀλλὰ σὺ μὲν νῦν στῆθι καὶ ἄμπνυε → but you, stop now and catch your breath | but do thou now stand, and get thy breath
Greek > English (Woodhouse Verbs Reversed)
(see also ἰσχύω): powerful, be binding, be in force, be in vogue, be powerful, be rife, be strong, be valid, be vigorous, have power, have strength, possess vitality
Lexicon Thucydideum
valere, pollere, to be strong, be powerful, 1.2.2, 1.3.2, 1.9.3, 1.13.6. 1.18.2, 1.36.1. 1.121.3. 1.121.31.122.1. 1.142.4. 1.143.5. 2.13.2. 2.87.4, 3.39.8. 3.46.3. 3.46.4, 3.82.7. 3.104.2. 4.68.6. 6.17.7. 6.18.6. 6.82.3, 8.47.2.