Strong's Concordance

Original word: ἀνταγωνίζομαι
Transliteration: antagónizomai
Definition (short): striving
Definition (full): to struggle against

NAS Exhaustive Concordance

Word Origin: from anti and agónizomai
Definition: to struggle against
NASB Translation: striving (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

From anti and agonizomai; to struggle against (figuratively) ("antagonize") -- strive against.

see GREEK anti

see GREEK agonizomai

KJV: Ye have not yet resisted unto blood, striving against sin.
NASB: You have not yet resisted to the point of shedding blood in your striving against sin;