early 20th cent. (originally US, as a trade name): from escaladeclimb a wall by ladder (from the noun escalade), on the pattern of elevator
英英釋義行業釋義網絡釋義
noun
1.a clause in a contract that provides for an increase or a decrease in wages or prices or benefits etc. depending on certain conditions (as a change in the cost of living index)
2.a stairway whose steps move continuously on a circulating belt