Expand on
Definition 1 of 1
Pro Tip 1/3Context Matters
Use 'expand on' when more information is needed to clarify a point. 
Could you expand on your plan for increasing sales?
Pro Tip 2/3Encourage Exploration
'Expand on' invites the speaker to explore the topic more deeply. 
In your essay, please expand on the historical context.
Pro Tip 3/3Avoid Repetition
Don't just repeat information; 'expand on' means to add new details or perspectives. 
She expanded on her argument by introducing fresh evidence.