“Double-dealer” in Japanese
Short answer
Double-dealer in Japanese is “内股膏薬” (uchimatakouyaku). Full meaning: double-dealer, fence-sitter, timeserver, moving back and forth between two sides in a conflict, duplicity, turncoat.
Other ways to say “Double-dealer” in Japanese
股座膏薬
mataguragouyaku double-dealer, timeserver, moving back and forth between two sides in a conflict
二股膏薬
futamatakouyaku double-dealer, timeserver, moving back and forth between two sides in a conflict
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