un·der·dog 
(ŭndər-dôg′, -dŏg′)
(ŭndər-dôg′, -dŏg′)n.
1. One that is expected to lose a contest or struggle, as in sports or politics.
2. One that is at a disadvantage.
- double-dip recession
- double displacement
- double-double
- double dribble
- double dutch
- double-edged
- double-entendre
- double entry
- double-faced
- double fault
- double-fault
- double feature
- double fertilization
- double figure
- double flat
- double genitive
- double Gloucester
- double-handed
- doublehanded
- double-handedly
- double-header
- doubleheader
- double helix
- double-hung window
- double indemnity