un·der·dog 
/ˈʌndɚˌdɑ:g/ noun
plural un·der·dogs /ˈʌndɚˌdɑ:g/ noun [count] 1 : a person, team, etc., that is expected to lose a contest or battle
▪ I always root for the underdog instead of the favorite. 2 : a less powerful person or thing that struggles against a more powerful person or thing (such as a corporation)
▪ As a lawyer, she consistently represented the underdog.
▪ I always root for the underdog instead of the favorite.
▪ As a lawyer, she consistently represented the underdog.
