Among several mouth morphemes in ASL (American Sign Language), the mouth movement AHH is a common usage.
The mouth movement AHH is commonly used when describing a long distance. E.g. FAR; a baseball ball flying high and far.
It's also used when describing emotions as "in awe", "very shocked",
Another usage of AAH is when describing something very long in some contexts. E.g. HALLWAY+aah. Not all can be used with AAH for "very long" time/distance.
Related topics: mouth morphemes
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