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Redouble
Common Collocations
Remember the phrases 'redouble efforts' and 'redouble commitment' to reinforce resolve or dedication. 
Emotionally Charged
Using 'redouble' adds urgency or seriousness to a situation, indicating a significant increase in effort or focus. 
Non-Physical Actions
'Redouble' is often used for non-tangible actions such as effort, commitment, or intensity, but not physical objects. 