assist

1. Origins, structure, and basic meaning

• Structure: The on-reading of 佐 is さ, and the character is associated with assisting someone.
• Basic usage: 補佐(ほさ) describes the role or action of assisting a person in charge.

2. Common pitfalls and similar expressions

• Person being assisted
  • 部長を補佐する means to assist the department head; を marks the person being assisted.
• Reading in a rank
  • 大佐 is a rank read たいさ. In this word, 大 is not read だい.