draw on phrasal verb ( see also ↑ draw )
1 . draw on/upon something to use information, experience, knowledge etc for a particular purpose:
His work draws heavily on learning theories of the 1980s.
She has 20 years’ teaching experience to draw on.
2 . draw on something to use part of a supply of something such as money:
I drew on my savings to pay for the repairs.
3 . draw on a cigarette/cigar etc to breathe in smoke from a cigarette etc
4 . British English formal if a period of time or an event draws on, it comes closer to its end:
Winter is drawing on.
As the journey drew on, he started to feel tired.