pre·sume 
/prɪˈzu:m, Brit prɪˈzju:m/ verb
pre·sumes; pre·sumed; pre·sum·ing /prɪˈzu:m, Brit prɪˈzju:m/ verb [+ obj] 1 a : to think that (something) is true without knowing that it is true
▪ I presume [=assume, expect] (that) you'll fly to Chicago rather than drive. ▪ I presume (that) the car was very expensive. = The car was very expensive, I presume. ▪ “Is she still at work?” “I presume so, since she's not home.”
b : to accept legally or officially that something is true until it is proved not true
▪ A person is presumed (to be) innocent until proven guilty in a court of law. ▪ The court must presume innocence until there is proof of guilt. ▪ After the earthquake several people were missing and presumed dead. [=believed to be dead] 2 formal : to do (something) that you do not have the right or permission to do — followed by to + verb ▪ How can you presume [=dare] to speak for her? ▪ I'm not going to presume to tell you how to do your job. 3 : to expect that someone has (a certain level of knowledge, skill, etc.)
▪ The course presumes familiarity with basic computer programming. [=people who take the course should know basic computer programming]
▪ I presume [=assume, expect] (that) you'll fly to Chicago rather than drive. ▪ I presume (that) the car was very expensive. = The car was very expensive, I presume. ▪ “Is she still at work?” “I presume so, since she's not home.”
b : to accept legally or officially that something is true until it is proved not true
▪ A person is presumed (to be) innocent until proven guilty in a court of law. ▪ The court must presume innocence until there is proof of guilt. ▪ After the earthquake several people were missing and presumed dead. [=believed to be dead]
▪ The course presumes familiarity with basic computer programming. [=people who take the course should know basic computer programming]
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)
▪ I don't want to presume on/upon our friendship by asking for too many favors.
▪ I don't want to presume on/upon our friendship by asking for too many favors.
