1) Biblical exchange for sword 2) Blade of a farm tool 3) Chinese invention 4) Cutting blade of a kind 5) Ploughshare 6) Share 7) Wedge 1) Ploughshare 
In agriculture, a plowshare (or ploughshare) is a component of a plow (plough). It is the cutting or leading edge of a moldboard which closely follows the coulter (one or more ground-breaking spikes) when plowing. The plowshare itself is often a hardened blade dressed into an integral moldboard (by the blacksmith) so making a unified combination o...
• (n.) Alt. of Ploughshare
[n] - a sharp steel wedge that cuts loose the top layer of soil
ploughshare noun a sharp steel wedge that cuts loose the top layer of soil