"felts" in the noun sense
a fabric made of compressed matted animal fibers
"felts" in the verb sense
mat together and make felt-like
"felt the wool"
cover with felt
"felt a cap"
3. felt, felt up, mat up, matt-up, matte up, matte, mat
change texture so as to become matted and felt-like
"The fabric felted up after several washes"
Source: WordNet® (An amazing lexical database of English)
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