Portuguese edit

 
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A hacksaw
modern bow saws

Noun edit

arco de serra f (plural serras de arco)

  1. hacksaw (fine-toothed, frame-mounted saw used to cut metal)
    Synonym: segueta
  2. 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: arco de serra para poda