The sign for "flat" has many interpretations depending
on the rest of your sentence.
FLAT (GENERAL)
Also means: "floor," or "carpet" (in context), or even
"shelf."



FLAT-SURFACE:
Use "bent hands." The right hand moves forward, the left hand stays
stationary.



FLAT-TIRE:
[This sign also can mean "deflate."] Use a quick motion unless
you are trying to indicate that something went slowly flat.




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American
Sign
Language (ASL) online at American Sign Language University ™
ASL resources by Lifeprint.com © Dr. William Vicars