Etymology
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escalator (n.)

1900, American English, trade name of an Otis Elevator Co. moving staircase, coined from escalade + -ator in elevator. Figurative use is from 1927 (in advertising).

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Definitions of escalator

escalator (n.)
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);
Synonyms: escalator clause
escalator (n.)
a stairway whose steps move continuously on a circulating belt;
Synonyms: moving staircase / moving stairway
From wordnet.princeton.edu