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stair:

The noun stair has 1 sense (first 1 from tagged texts)

1. (1) step, stair -- (support consisting of a place to rest the foot while ascending or descending a stairway; "he paused on the bottom step")

climbing:

The noun climbing has 1 sense (no senses from tagged texts)

1. climb, climbing, mounting -- (an event that involves rising to a higher point (as in altitude or temperature or intensity etc.))

The verb climb has 6 senses (first 3 from tagged texts)

1. (36) climb, climb up, mount, go up -- (go upward with gradual or continuous progress; "Did you ever climb up the hill behind your house?")
2. (2) climb -- (move with difficulty, by grasping)
3. (2) wax, mount, climb, rise -- (go up or advance; "Sales were climbing after prices were lowered")
4. climb -- (slope upward; "The path climbed all the way to the top of the hill")
5. climb -- (improve one's social status; "This young man knows how to climb the social ladder")
6. rise, go up, climb -- (increase in value or to a higher point; "prices climbed steeply"; "the value of our house rose sharply last year")

truck:

The noun truck has 2 senses (first 1 from tagged texts)

1. (20) truck, motortruck -- (an automotive vehicle suitable for hauling)
2. hand truck, truck -- (a handcart that has a frame with two low wheels and a ledge at the bottom and handles at the top; used to move crates or other heavy objects)

The verb truck has 1 sense (first 1 from tagged texts)

1. (1) truck -- (convey (goods etc.) by truck; "truck fresh vegetables across the mountains")

stair climbing truck

stair climbing hand trucks
a wide range of manual and powered stair climbing hand trucks with capacities from 90kg to 680kg
http://www.stairclimber.co.uk