לָשַׁן lâshan (H3960)

to wag the tongue, i.e. to calumniate

1) to use the tongue, slander 1a) (Poel) to slander 1b) (Piel) to slander 1c) (Hiphil) to accuse

a primitive root; properly, to lick; but used only as a denominative from לָשׁוֹן (H3956);