underdog

A competitor thought unlikely to win. / Somebody at a disadvantage.

Japanese Meaning

勝つ見込みの薄い競争者 / 劣勢な立場にある者

The underdog surprised everyone by winning the championship.

勝つとは思われていなかったチームが優勝して、皆を驚かせた。

Sense（1）

A competitor thought unlikely to win.

In Athens, the Americans are underdogs to the Chinese and the Canadians (the Canadians!)

Sense（2）

Somebody at a disadvantage.

Sense（3）

underdogs

（ plural ）