#2348 θνῄσκω thnesko {thnay'-sko}

 a strengthened form of a simpler primary thano {than'-o} (which
    is used for it only in certain tenses); TDNT - 3:7,312; v

—Greek Word Study (Transliteration-Pronunciation Etymology & Grammar)

 1) to die, to be dead
 2) metaph. to be spiritually dead

—Thayer's (New Testament Greek-English Lexicon)

—Strong's (Greek Dictionary of the New Testament)

—NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries

 AV - be dead 10, die 1, dead man 1, dead 1; 13

—Exhaustive Concordance (KJV Translation Frequency & Location)