balbucear

v. stammer, stutter; babble, mumble; prattle; lisp

= babble, stammer.
Ex: He immerses us in 'language that is unique for its copiousness,' now speaking 'of exquisite intimations that can occur only in a half-light,' then babbling 'of chamber-pots, leg-irons, factories and policemen'.
Ex: People who stammer may find they are quite fluent if they sing, whisper or speak as part of a group.
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* decir balbuceando = splutter, sputter.