Answer: underdo

AnswerCrossword Clue
UNDERDOFall short with
UNDERDOGive less than one's all
UNDERDOCook rare.
UNDERDOCook for less than the usual time.
UNDERDOCook rare
UNDERDOBarely cook, say
UNDERDONot cook enough
underdoto do (something) inadequately
underdoto do insufficiently