振るう

1. Origins, structure, and basic meaning

• Structure: 振るう is read as ふるう and is a transitive verb for swinging a tool forcefully or actively exercising power, ability, or skill.
• Basic usage: Use ハンマーを振るう for a physical swing and the idiom 腕を振るう for displaying skill.

2. Common pitfalls and similar expressions

• Difference from 振る
  • 振る names a waving or shaking motion, while 振るう more strongly suggests force or the full exercise of an ability.
• Idiom 腕を振るう
  • It does not mean literally waving an arm; it is an idiom for making full use of one's skill, often in cooking or craft.