expatiateverb · Level 3 SAT1add details, as to an account or ideaThe professor expatiated on the theory of relativity for the benefit of students unfamiliar with its nuances.ModuleLevel 3Registeracademic, argumentCollectionCollection 038SAT Complete planAlso in Collection 038pollute, prognostication, repel, defection, lucubrate, criminate, premiss, argufy and 1 more