綱

1. Origins, structure, and basic meaning

• Structure: 綱 is read as つな and is a noun for a strong rope used for pulling or securing.
• Basic usage: Use 太い綱を引く when pulling a boat and 古い綱を新しいものに替える when replacing one.

2. Common pitfalls and similar expressions

• Function and strength
  • 綱 suggests a strong rope used for pulling or securing, but context determines its exact thickness and material.
• Relation to 縄
  • Both can translate as rope; 綱 often suggests a stouter rope bearing greater force, though the boundary is not absolute.