undervalue (someone's) efforts

Translations
недооценивать усилия (кого-то)
The manager tends to undervalue his team's efforts.
Менеджер склонен недооценивать усилия своей команды.
Definitions
To regard or treat someone's contributions, work, or efforts as less important or significant than they actually are.
Words
effort

noun
усилие
undervalue

verb
недооценивать