dou·ble·tree 
(dŭbəl-trē′)
(dŭbəl-trē′)n.
A crossbar on a wagon or carriage to which two whiffletrees are attached for harnessing two animals abreast.
- serval
- servant
- serve
- server
- serve right
- serve (someone) right
- serve someone right
- Servetus
- serve up
- service
- Service
- serviceability
- serviceable
- serviceableness
- serviceably
- serviceberry
- service break
- board of education
- board of trade
- boardroom
- board rule
- boardsailing
- board sailor
- board shorts
- boardshorts