moving staircase
- noun
- Sometimes the cascade looked like a moving staircase—an escalator—or a playing-cards ladder.
Examples
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At the mall, you can take a moving staircase to access the upper floors without having to climb stairs.
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The hotel lobby has a moving staircase that transports guests smoothly between levels.
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The airport features a moving staircase to help travelers easily reach the departure gates.
Synonyms
A moving staircase that carries people between floors
A set of steps that move to carry people between floors
Surface Forms
Morphology
The meaning is directly compositional: 'moving' modifies 'staircase', so a learner who knows both words can infer a staircase that moves to transport people between floors. This adjective+noun composition is a common and predictable pattern in English (and in many languages there are analogous constructions or a lexicalized equivalent like 'escalator'), so the expression is immediately accessible to a B1 learner.
Etymology
Moving staircase comes from the simple image of a staircase whose moving steps go around like a belt and carry people who stand on them. So it means 'a stairway with steps that move' used to take people between floors.