結託

1. Origins, structure, and basic meaning

• Structure: 結託 is a noun and する verb for parties joining together in a scheme, and is read けったく.
• Basic usage: It denotes collusion for an improper purpose, as in 二人が結託する and 不正な結託を調査する.

2. Common pitfalls and similar expressions

• Action and noun
  • 結託して数字を隠す presents the action, while 業者同士の結託 names the collusive relationship itself.
• Difference from 協力
  • 協力 broadly denotes cooperation without judging the goal, whereas 結託 usually carries the negative judgment of collusion.