Abbott-Smith Manual Greek Lexicon
ἀθλέω (G118)
2 * ἀθλέω , -ῶ (in cl. also ἀθλεύω , ἆθλος , a contest , in war or in sport), to contend in games, wrestle , combat : II Ti 2:5 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain