from H3813 (or perhaps for active participle of H3874); properly, muffled, i.e. silently; softly.
Usages throughout the bible
Judges 4:21
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Then Jael Heber's wife took a nail of the tent, and took an hammer in her hand, and went softly H3814 unto him, and smote the nail into his temples, and fastened it into the ground: for he was fast asleep and weary. So he died.