Definition of outspeak:
(v) :
(transitive) To surpass in speaking; say or express more than; signify or claim superiority to; be superior to in meaning or significance; speak louder than.
(v) :
(intransitive, rare, dialectal) To speak out or aloud.
(v) :
(transitive, rare, dialectal) To declare; utter; express; vocalise.