ploughshare
noun /ˈplaʊʃeə(r)/
  /ˈplaʊʃer/
(British English) (North American English plowshare)
 (North American English also share)
Idioms - the broad curved blade (= metal cutting edge) of a ploughWord Originlate Middle English: from plough + Old English scær, scear ‘ploughshare’ (related to shear).
 
Idioms 
turn swords into ploughshares 
- (literary) to stop fighting and return to peaceful activitiesTopics War and conflictc2