How to say "collusion" in Japanese

• 共謀きょうぼうCommon
  noun, suru verb, transitive verbThe general word for secretly plotting or acting together, typically for a criminal or wrongful purpose; it covers conspiracy and collusion in the broadest sense.
• 談合だんごうCommon
  noun, suru verb, intransitive verbSpecifically collusion on contract bidding — bid rigging — or an illegal price-fixing agreement; the natural choice when the collusion concerns tenders or prices, not general plotting.
• 結託けったくCommon
  noun, suru verb, intransitive verbCollusion or conspiracy framed as banding together with another party for a shared, typically underhanded aim; close to 共謀, but it foregrounds the alliance between the parties.
• 野合やごうCommon
  noun, suru verb, intransitive verbIts primary sense is an illicit union; 'collusion' is a secondary extension, and this is seldom the word you want for collusion in ordinary contexts.
• 癒着ゆちゃくCommon
  noun, suru verb, intransitive verbCollusion as a cozy, entangled relationship in which the parties look out for one another's interests, as between officials and the industry they oversee; it names the relationship rather than a single plotted act.

For secret joint plotting use 共謀; for bid rigging or price-fixing use 談合; for banding together with another party use 結託; for a cozy collusive relationship use 癒着; 野合 mainly means illicit union.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 共謀きょうぼうconspiracy
• 談合だんごうbid rigging
• 結託けったくconspiracy
• 野合やごうillicit union
• 馴れ合いなれあいcollusion
• 通謀つうぼうcollusion
• コリュージョンcollusion
• 策応さくおうcollusion
• 内通ないつうsecret communication (with the enemy)
• なあなあcompromise
• 内応ないおうsecret understanding
• 気脈きみゃくtacit understanding
• 共犯関係きょうはんかんけいcomplicity (in a crime)
• 癒着ゆちゃくcollusion