investigation

Idioms (3)

• due diligence Neutral · CEFR C1
  the careful investigation of a company's business, finances, and legal position before investing
• red herring Neutral · CEFR C1
  a misleading clue or distraction that draws attention away from the real issue
• leave no stone unturned Neutral · CEFR B2
  to try every possible way to achieve or find something