one at a disadvantage and expected to lose
We go into this game as the underdogs
failure, loser, nonstarter, unsuccessful person
بازنده، ستم دیده، مظلوم، فلک زده
( Test )
Williams was an underdog when she arrived at the All England Club ranked just 16th, but she was finally healthy after a series of injuries.
In this sentence, underdog means: