Italian edit

 
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modern bow saws
A hacksaw

Noun edit

sega ad arco f (plural seghe ad archi)

  1. bow saw (a lightweight metal-framed saw in the shape of a bow with a removable coarse wide blade, used for cutting tree trunks)
    Synonym: seghetto ad arco
  2. hacksaw (fine-toothed, frame-mounted saw used to cut metal)
    Synonyms: seghetto ad arco, sega ad arco per ferro, sega ad arco per metallo