πυκτέω G4438
pyktéō · pook-teh'-o · Verb
from a derivative of the same as πυγμή; to box (with the fist), i.e. contend (as a boxer) at the games (figuratively):--fight.
1 Occurrence in the King James Bible
1 Corinthians 9:26I therefore so run, not as uncertainly; so fight I, not as one that beateth the air: