Kerb is definitely not AE. We write it as curb.

I have read "dropped curb", "lowered curb" and (more often) "curb cut" in AE. My personal favorite are the "depressed curbs" though. (I think of those as feeling sad and helpless because people walk all over them).

"Curb cut " is sometimes used in a less specific sense to mean the portion of the curb and sidewalk over which access by (automotive) vehicles is permissible - i.e. driveways. Sometimes curb cuts are identified specifically as "pedestrian curb cuts."

Aus dem Cambridge-Link in #5 :

 dropped kerb

noun [ C ]

UK

uk/ˌdrɒpt ˈkɜːb/     us /ˌdrɑːpt ˈkɝːb/

(US curb cut)

a place where thekerb (= edge of a raised path next to the road) is made to slope down to the level of the road, so it is easier for people with vehicles such as wheelchairs or pushchairs to get on or off the path:

We must take the lead in providing dropped kerbs at junctions and ramps, and tactile information and acoustic signals at road crossings. ...

... dazu noch :

https://dictionary.cambridge.org/dictionary/e...

 curb cut

noun [ C ]

US

uk /ˈkɜːb ˌkʌt/ us    /ˈkɝːb ˌkʌt/

(UK dropped kerb)

a place where the kerb (= edge of a raised path next to the road) is made to slope down to the level of the road, so it is easier for people with vehicles such as wheelchairs or pushchairs to get on or off the path:

The community began to build ramps into buildings, make curb cuts and equip buses with chair lifts. ...

https://www.merriam-webster.com/dictionary/cu...

 curb cut

noun

variants or curb ramp

plural curb cuts or curb ramps

1   : a ramp cut into a street curb to provide access (as for wheelchairs or strollers) between a sidewalk and the street

 ... 2   : a ramp cut into a street curb to provide vehicular access to a driveway or parking space ...

Zur Ergänzung: Die ADA (Americans with Disabilities Act) kennt den Ausdruck curb ramp, was ich als Gehsteigabsenkung übersetzen würde.

Quelle: https://www.ada.gov/law-and-regs/design-standards/ 

Im Hauptdokument steht im Kapitel »106.5 Defined Terms«: Curb Ramp. A short ramp cutting through a curb or built up to it«. Im Kapitel »406 Curb Ramps« gibt’s Illustrationen dazu.

Eine curb ramp ist eine Bordsteinrampe, die es z.B. erlaubt, einen Rollstuhl auf einen nicht abgesenkten Bordstein hinaufzuschieben..

Eine curb ramp ist eine Bordsteinrampe, die es z.B. erlaubt, einen Rollstuhl auf einen nicht abgesenkten Bordstein hinaufzuschieben..

To make it clear: #8 is wrong. As others have pointed out, a curb cut can be a ramp that lowers the level of the sidewalk/walking surface down to street level on the sidewalk side of the curb or that brings street level up to the level of the curb on the street side of the curb.

RE #11: I guess that the ADA doesn't know what it's talking about. 😉