double down
Double down (phrasal verb) means to commit even more firmly to a position, strategy or claim, especially after it has been criticised or has started to go wrong. Example: “Rather than apologise, he doubled down on the accusation.”
How to use double down
Learner’s notesIn plain EnglishIt means sticking to something harder instead of backing off.
Neutral and very common in journalism and business writing. It often carries a hint of stubbornness, so it is rarely a compliment when used about a person defending a mistake.
The preposition is fixed: you double down *on* something, never double down *in* or *with* it.