Definition of coarticulate:
(v) :
To articulate two things simultaneously.
(v) :
(phonology) To assimilate the place of articulation of one speech sound to that of an adjacent speech sound.
(v) :
(phonetics) To articulate a speech sound at two different places of articulation simultaneously, as in the labiovelar approximant [[[w]]].
(v) :
(anatomy) To unite to form an articulation (joint)