Strong’s Greek
G4438 — pukteuo
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
πυκτεύω
pukteuo — pronounced pook-te-yoo'-o
from a derivative of the same as 4435; to box (with the fist), i.e. contend (as a boxer) at the games (figuratively):--fight. see GREEK for 4435
1 occurrence in the KJV.
1 Corinthians 9:26
I therefore so run, not as uncertainly; so fight I, not as one that beateth the air: