Strong's Concordance

Original word: שָׁמְרָה
Transliteration: shomrah
Definition (short): guard
Definition (full): a guard, watch

NAS Exhaustive Concordance

Word Origin: from shamar
Definition: a guard, watch
NASB Translation: guard (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

Feminine of an unused noun from shamar meaning a guard; watchfulness -- watch.

see HEBREW shamar

KJV: Set a watch, O LORD, before my mouth; keep the door of my lips.
NASB: Set a guard, O LORD, over my mouth; Keep watch over the door of my lips.