#1127 γρηγορεύω [γρηγορέω] gregoreuo {gray-gor-yoo'-o}

 from G1453; TDNT - 2:338,195; v

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

 1) to watch
 2) metaph. give strict attention to, be cautious, active
    2a) to take heed lest through remission and indolence some
        destructive calamity suddenly overtake one

—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 - watch 21, wake 1, be vigilant 1; 23

—Exhaustive Concordance (KJV Translation Frequency & Location)