expand on/upon something phrasal verb ( see also ↑ expand )
to add more details or information to something that you have already said:
Payne later expanded on his initial statement.
expand on/upon something phrasal verb ( see also ↑ expand )
to add more details or information to something that you have already said:
Payne later expanded on his initial statement.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012