work together on a common enterprise of project; "The soprano and the pianist did not get together very well"; "We joined forces with another research group"
cooperate as a traitor; "he collaborated with the Nazis when they occupied Paris"
eject or send out in large quantities, also metaphorical; "the volcano spews out molten rocks every day"; "The editors of the paper spew out hostile articles about the Presidential candidate"
an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom; "he could not suppress a yawn"; "the yawning in the audience told him it was time to stop"; "he apologized for his oscitancy"
utter a yawn, as from lack of oxygen or when one is tired; "The child yawned during the long performance"