English definition of “underestimate”
/ˌʌndərˈestɪmeɪt/ verb [T]
SIZE/AMOUNT › to not understand how large, strong, or important something is: Many people underestimate the cost of owning a car.
PERSON › to not understand how powerful or clever someone is: I thought it would be an easy game but I had underestimated my opponent. → Opposite overestimate