down - eart
- down drop
- down gust
- down leg
- down link
- down lock roller
- down operation
- down position
- down time
- down ward gust
- down wash
- down wind
- down-lock actuating rod
- down-lock limit switch
- down-lock lug
- down-slope direction
- down-wind leg
- downburst
- downcheck
- downcounter
- downdraft
- downdraught
- downdraught carburettor
- downgrade a category to
- downgrading
- downhill runway
- downlatch
- downleg
- downline loading
- downlink
- downlink equation
- downlink frequency
- downlink satellite radio channel
- downlinked
- downlinking
- downlock
- downlock bungee spring
- downlock latch
- downslope direction
- downstop
- downstream
