double down
The phrase for raising a commitment already made.
In blackjack, to double down is to double the bet on a hand already dealt. Use the phrase when someone increases a commitment already made. Do not use it as a synonym for insist, repeat, or do more.
Examples
UseAfter the first denial, she doubled down and filed a second brief.
AvoidThe memo told the staff to double down on quality. (use improve the work)