verb
-sumes; -sumed; -suming
[+ obj] to think that (something) is true without knowing that it is true
to accept legally or officially that something is true until it is proved not true
formal :to do (something) that you do not have the right or permission to do - followed by to + verb
to expect that someone has (a certain level of knowledge, skill, etc.)
presume on/upon
[phrasal verb]
presume on/upon (something) formal :to expect too much from (a relationship) in a way that shows that you do not understand your role in the relationship :to go beyond the proper limits of (a relationship)