a saw for cutting metal, consisting typically of a narrow, fine-toothed blade fixed in a frame.
Also, hack saw.

1645–55; hack1 + saw1

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World English Dictionary
hacksaw (ˈhækˌsɔː)
1.  a handsaw for cutting metal, with a hard-steel blade in a frame under tension
vb , -saws, -sawing, -sawed, -sawed, -sawn
2.  (tr) to cut with a hacksaw

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Example sentences
Only the grit was useful, mostly for industrial applications such as dental
  drills and hacksaw blades.
G--Use a hacksaw to trim off the excess handle and wedge flush with the tool
Cuts bars to required lengths using hacksaw, bar cutters or acetylene torch.
Hacksaw marks on gage ladder bracket on landward side of gage house.
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