Say if someone asked you a yes/no question, and you make that note of assent with your throat to let them know that yes is the answer to the question, how would you describe that through writing? I don't just want to say 'She made a note of assent' or whatever... Is there an actual descriptive word, or onomatopoeic word I can use?
"She made a grunt of assent"
1. "Uh–huh" (open mouth)
interjection \two əm's or two ən's separated by the voiceless sound h; ˈəⁿ-(ˌ)həⁿ, (ˌ)əⁿ-ˈ\
Definition of UH-HUH
—used to indicate affirmation, agreement, or gratification
2."Mmm-hmm" (closed mouth)
Experimenting with Google Ngram, and trying "* of assent,* of dissent"-- the machine suggests that "murmur of assent" is the big winner here.
I have to +1 "grunt" as suggested above, and "growl," and "sigh" and whatever other sound or gesture seems appropriate.