Curb vs. Kerb
For the raised edge of a road, Cambridge documents US “curb” and UK “kerb.” The verb and noun “curb” meaning control or limit are separate senses and are not changed to “kerb.”
For a road edge, use “curb” in US English and “kerb” in UK English. Use “curb” for the control/limit senses.
Key details
Choose the right form
| Meaning / situation | Form / construction | Decision |
|---|---|---|
| raised road edge in US English | curb | Use the US spelling. |
| raised road edge in UK English | kerb | Use the UK spelling. |
| verb or noun meaning control/restraint | curb | Use “curb”; this sense does not switch to “kerb.” |
Quick tests
Meaning / construction test
Are you referring specifically to the raised edge of a road?
If yes: Use “curb” in US English and “kerb” in UK English.
If no: For the control/limit senses, use “curb.”
Caveat: Only the road-edge noun has the documented curb/kerb regional split; the control/limit senses use “curb.”
Examples
The car stopped beside the curb.
This is the US road-edge spelling.
The car stopped beside the kerb.
This is the UK road-edge spelling.
The new rule aims to curb waste.
The verb meaning limit remains “curb.”
Further guidance
Core difference
Only the road-edge noun has the documented curb/kerb regional split.
Fast Test
Identify the intended sense first, then apply the documented regional or domain spelling for that sense.
Variant Boundary
Do not change the verb “curb” or the noun meaning a restraint/limit to “kerb.”
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- Curb — Cambridge Dictionary (opens in a new tab)Cambridge Dictionary · Curb entry separating the general control/limit senses from US curb for the road-edge noun
- Kerb — Cambridge Dictionary (opens in a new tab)Cambridge Dictionary · Kerb entry documenting UK kerb and US curb for the raised road edge