Hi Michel,
Sickle = serpe ou faucille, toutes les deux ont la lame concave, non?
In English I think "machete" covers most kinds of large utilitarian blades.
Sickle, bill-hook and scythe cover the concave blades.
For arms, sabre, cutlass and "scimitar" all represent blade with convex cutting edge. I think most kinds of SE Asian klewangs would generally be termed machetes in English, regardless of curvature, thickness or blade profile.
Cheers,
Emanuel
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