עָשַׁת
From LSJ
Ὅρκον δὲ φεῦγε καὶ δικαίως κἀδίκως (κἂν δικαίως ὀμνύῃς) → Iurare fugias, vere, falso, haud interest → Zu schwören meide, gleich ob richtig oder falsch
English (Strong)
a primitive root; probably to be sleek, i.e. glossy; hence (through the idea of polishing) to excogitate (as if forming in the mind): shine, think.