root for the underdog

Translations
болеть за аутсайдера
He always roots for the underdog in sports competitions.
Он всегда болеет за аутсайдера в спортивных соревнованиях.
Definitions
To support or cheer for a person or team that is expected to lose or is at a disadvantage in a competition or situation.
Words
root

verb
болеть
for

preposition
за
the

article or possessive pronoun
этот
underdog

noun
аутсайдер