spool down
In real, traceable use. Part of the curated seed collection; community review is coming.
Meaning · English
To decrease in rotational speed, producing a decrease in thrust.
Where it’s used:
Used
American English
Examples
All ground personnel MUST be made aware that big jet engines take a considerable time to spool down. We don't want any more mechanics getting sucked in or catapulted across the apron.
Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30)
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Common questions
What does “spool down” mean?
To decrease in rotational speed, producing a decrease in thrust.
Is “spool down” formal or informal?
No register label has been reviewed yet — treat it as neutral and check the usage notes above.