Definition of speak for
: to express the thoughts or opinions of (someone) They chose him to speak for the group. Speaking only for myself, I'm against the plan. “We don't want any dessert.” “Speak for yourself. I want some.” —often used figuratively I don't need to say more. The facts speak for themselves.
Word by Word Definitions
: to utter words or articulate sounds with the ordinary voice : talk
: to express thoughts, opinions, or feelings orally
: to extend a greeting
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