The "1"-handshape classifier (CL:1) is typically used to show long skinny things:
person standing in a certain location
person walking upright
WALK: "CL:1 version"
Here's an example of CL:1 being used to show a person walking by:
Note: At one time the sign for "KILL"
was probably based on a "CL1" handshape representing a knife. I'm
not saying that the sign for KILL is a classifier. No, no, no. What
I'm saying is that many signs started out as classifiers and then
became "lexicalized" (standardized, fossilized, frozen into specific
signs) and are no longer classifiers. My point here though is
that CL1 can be used to show a knife.
Also see: Classifier 3
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