to redouble
01
to strengthen markedly
Formal
例子
After the criticism, she redoubled her efforts to improve her performance.
The teacher redoubled vigilance to ensure students followed the safety rules.
02
to increase a quantity, number, or amount twofold once more
例子
The investors decided to redouble their initial capital after seeing early profits.
Production was redoubled to meet the growing demand for masks.
