Meaning: a language in visual-spatial modality (signing) used by Deaf people; the opposite medium of vocal-aural modality (speech) used by hearing people.
Signed language is a term equivalent to spoken language. When using one of the terms in either spoken or signed forms, be aware of whichever modality or language you're talking about.
ASL is a language rather than "a sign language" because ASL is a language, no less than spoken language as we don't say English / French / other (speech) language is a "speech language" instead of "language".
Another thing to deconstruct, people often say "I learned sign language", "I know sign language a little". Which language? Sign language. Which sign language? ASL. Okay. We don't say "I'm learning a new speech language." Right? Which speech language? French? Spanish?
Gloss: MIND (YOU)TEACH-ME SIGNS/SIGN-LANGUAGE?
English equivalent: Can you teach me sign language?
Quotations as Food for Thought:
"Sign language is a human right, it is not just an option. Not a privilege." -- Meme, 21st century.
"I cannot understand how a language like sign language - the richest in expressions, the most energetic, the most advantageous in its universal intelligibility is still so neglected and that only the deaf speak it. This is, I confess, one of those irrationalities of the human mind that I cannot explain." -- Pierre Desloges, 1779.
"The belief that speech is central to language is an analog to the belief that earth is center of the universe. The former is still practiced today -- hundreds of years older than the latter." -- Jolanta Lapiak, 2000s.