underdog

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++un·der·dog /ˈʌndədɒɡ $ ˈʌndərdɒːɡ/ noun [countable]  DSa person, team etc that is weaker than the others, is always expected to be unsuccessful, and that is often treated badly 处于劣势的人[队]；弱者，弱方 Crowds often feel sympathy for the underdog. 观众经常会同情弱者。

Examples from the Corpus

underdog• They like to believe they are underdogs.• And the underdogs fully deserved their win over the Galway men.• Yes, they are the underdog.• As the underdog here, they have nothing to lose and everything to gain.• Did they make fun of him for speaking up for the underdog in school?• But the vice-president is now the underdog in this race.• Pepsi has responded to this multi-pronged assault by playing the underdog card.• Whether his party is a double winner ... or remains the underdog ... is in the hands of the voters.

un·der·dog nounChineseSyllable  

weaker Corpus others, that team is than a person, is the etc

underdog
un‧der‧dog /ˈʌndədɒɡ $ ˈʌndərdɒːɡ/ noun [countable]
a person, team etc that is weaker than the others, is always expected to be unsuccessful, and that is often treated badly:
    Crowds often feel sympathy for the underdog.

under·dogBrE /ˈʌndədɒɡ/ 🔊NAmE /ˈʌndərdɔːɡ/ 🔊, /ˈʌndərdɑːɡ/ 🔊 nouna person, team, country, etc. that is thought to be in a weaker position than others and therefore not likely to be successful, win a competition, etc. 处于劣势的人（或团队、国家等）；弱者；比赛前不被看好者◆Before the game we were definitely the underdogs. 我们在赛前绝对不被看好。🔊🔊◆In politics, he was a champion of the underdog (= always fought for the rights of weaker people). 在政治上，他总是为弱势群体争取权益。🔊🔊 OPP overdog