両刃

1. Origins, structure, and basic meaning

• Structure: 両刃 is a noun read りょうば, meaning a double-edged blade or a blade sharpened for use from both sides.
• Basic usage: Use 両刃なので to give the blade structure as a reason and 両刃の刃物 to modify a bladed tool.
  • この包丁は両刃なので、左右どちらの手でも使いやすい。 says that the knife is easy to use with either hand because it is double-edged; 職人は両刃の刃物を慎重に研いだ。 describes an artisan carefully sharpening a double-edged tool.

2. Common pitfalls and similar expressions

• 両刃なので
  • ので gives the double-edged structure as the reason for ease of use with either hand.
• 両刃の刃物
  • の modifies the following tool as double-edged.
• 両刃 and 片刃
  • 両刃 has edges on both sides, whereas 片刃 is sharpened on one side.