sweat·shop 
(swĕtshŏp′)
(swĕtshŏp′)n.
A shop or factory in which employees work long hours at low wages under poor conditions.
- three-card monte
- three-color
- three-D
- three-decker
- three-dimensional
- three-gaited
- three-legged race
- Three Mile Island
- three-mile limit
- three-peat
- threepence
- threepenny
- three-piece
- three-ply
- three-point landing
- three-point line
- three-quarter
- three-quarter binding
- three-ring circus
- three R's
- threescore
- three sheets in the wind
- three sheets to/in the wind
- three sheets to the wind
- Three Sisters