rein in
In real, traceable use. Part of the curated seed collection; community review is coming.
Also seen as: reign in
Sense 1
Meaning · English
To stop or slow a horse by pulling the reins
Where it’s used:
Used
American English
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Sense 2
Meaning · English
To stop or slow something, by exercising control.
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Common questions
What does “rein in” mean?
To stop or slow a horse by pulling the reins
Is “rein in” formal or informal?
No register label has been reviewed yet — treat it as neutral and check the usage notes above.