or[enlarge upon] or[expand on] or[expand upon] {v.} To talk or write more about; say or explain more completely or at greater length. * /The teacher enlarged on the uses of atomic power./
or[enlarge upon] or[expand on] or[expand upon] {v.} To talk or write more about; say or explain more completely or at greater length. * /The teacher enlarged on the uses of atomic power./