together

1. Origins, structure, and basic meaning

• Structure: 共 expresses togetherness and is read きょう in 共同(きょうどう) and 共通(きょうつう).
• Basic usage: 共同 focuses on doing something jointly, while 共通 focuses on features shared by different people or things.

2. Common pitfalls and similar expressions

• A companion and accompanying change
  • 共に(ともに) means together; 友人と共に means together with a friend. 人口の増加と共に describes another change occurring alongside population growth.