sell someone/yourself/something short

US /sel ˈsʌm.wʌn/jʊərˈself/ˈsʌm.θɪŋ ʃɔrt/
UK /sel ˈsʌm.wʌn/jʊərˈself/ˈsʌm.θɪŋ ʃɔrt/
"sell someone/yourself/something short" picture
1.

subestimar, desvalorizar

to underestimate or undervalue someone or something

:
Don't sell yourself short; you have a lot of valuable skills.
Não se subestime; você tem muitas habilidades valiosas.
It would be a mistake to sell them short in this competition.
Seria um erro subestimá-los nesta competição.