0 a person or group of people with less power, money, etc. than the rest of society -- los desamparados, los grupos menos favorecidos
As a politician, her sympathy was always for the underdog in society.
1 a weak person who is dominated by someone else, or who is the loser in a struggle -- desfavorecido; desvalido; desamparado
He always likes to help the underdog.
