Question 1

What does "spool down" mean?

Accepted Answer

Of an engine or rotating machine, to gradually decelerate after power is reduced

Question 2

How do you use "spool down" in a sentence?

Accepted Answer

After the pilot shut off the fuel, the engines began to spool down slowly.

Question 3

Is "spool down" formal or informal?

Accepted Answer

"spool down" is register-neutral — appropriate in both casual and formal contexts. Technical term used in aviation, computing, and engineering. Refers to the gradual deceleration of a spinning system such as a jet turbine or hard drive. The opposite is 'spool up.' Can also be used transitively ('spool down the engine'). Not common in everyday speech.

spool down

관련 구문

"down" 포함 구문