Longman Dictionary of Contemporary English homepage

scale

2 verb
     
scale2 [transitive]
1 to climb to the top of something that is high and difficult to climb:
Rescuers had to scale a 300m cliff to reach the injured climber.
2 technical to make writing or a picture the right size for a particular purpose
scale something to something
The writing can be scaled to any size, depending on the paper.
3

scale the heights

to be extremely successful:
By the age of 21 he had already scaled the heights in the academic world.

scale something ↔ down/back

phrasal verb
to reduce the amount or size of something:
The emergency aid programme has now been scaled down.

scale something ↔ up

phrasal verb
to increase the amount or size of something [↪ decrease]:
Production at the factory is being scaled up.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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