A Gesture (n.) must precede the word, not follow it, so as to announce it and rouse attention.
A Gesture (n.) must not follow the word but come just before it, to announce it and rouse attention.
Gesture (n.) lets one follow a conversation through a window without hearing a word: the speaker argues, modifies, urges, and concludes in triumph.
Gesture (n.) is a language more universal than words: it carries the form of a conversation rather than its matter, as a bass accompanies a melody.
A Gesture (n.) is a universal language of nature that conveys the form of a conversation without its matter — from a window one can tell a man is arguing, complaining, or boasting of a foiled plot without hearing a word.