a tongue muscle

role

important, significant

importance, consequence, significance

to open / to make (a hole)

to broaden; to become wide / to develop; to progress; to improve / (of a person) to be enlightened; to be inspired; (perfect tense) to be sharp or clever

muscle / tendon / have an aptitude / vein / (usually in place names) road

bone

jaw

jaw / chin / barb / jaw of a machine