From la'at (or perhaps for active participle of luwt); properly, muffled, i.e. Silently -- softly.
see HEBREW la'at
see HEBREW luwt
H3814. lat
לָאט Judges 4:21, etc., see לוּט.
לָאט לָּט, noun [masculine] secrecy, mystery; — absolute לָט 1 Samuel 18:22 2t., לָאט Judges 4:21; plural suffix לָטֵיהֶם Exodus 7:22 2t.; לַהֲטֵיהֶם 7:11; — always with ׃בְּ
1 בַּלָּט = secretly 1 Samuel 18:22; 24:5; Ruth 3:7; so בַּלָּאט Judges 4:21.
2 בְּלָטֵיהֶם with their mysteries = enchantments (i. e. of מִצְרַיִם חַרְטֻמֵּי) Exodus 7:22; 8:3; 8:14 = בְּלַהֲטֵיהֶם 7:11 (all P).