secret plan

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a secret scheme to do something (especially something underhand or illegal)
- they concocted a plot to discredit the governor
- I saw through his little game from the start
• Syn:
plot, game
• Derivationally related forms:
plot (for: plot)
• Hypernyms:
scheme, strategy
• Hyponyms:
counterplot, counterplan, intrigue, machination, conspiracy, cabal