From nasha'; dissimulation -- deceit.
see HEBREW nasha'
H4860. mashshaon
מַשָּׁאוֺן noun [masculine] guile, dissimulation ( > according to LagBN 196 derived from מַשָּׁא, lending on usury); בְּמַשָּׁאוֺן שִׂנְאָה תִּכַּסֶּה Proverbs 26:26 hatred may hide itself with dissimulation.