Strong's Concordance

Original word: μηκύνω
Transliteration: mékunó
Definition (short): grows
Definition (full): to lengthen, grow

NAS Exhaustive Concordance

Word Origin: from mékos
Definition: to lengthen, grow
NASB Translation: grows (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

From mekos; to lengthen, i.e. (middle voice) to enlarge -- grow up.

see GREEK mekos

KJV: And should sleep, and rise night and day, and the seed should spring and grow up, he knoweth not how.
NASB: and he goes to bed at night and gets up by day, and the seed sprouts and grows-- how, he himself does not know.