presume on something Definition

presume
verb presumed, presuming

1. To suppose (something to be the case) without proof; to take something for granted.

Example: presumed he was dead
Thesaurus: suppose, presuppose, think, believe, take for granted, assume, infer, conjecture, take it, surmise, hypothesize, venture.
2. To be bold enough; especially without the proper right or knowledge; to venture.

Example: wouldn't presume to advise the experts
Thesaurus: take the liberty, dare, go so far.

Etymology: 14c: from Latin praesumere to take in advance.

Phrasal Verb: presume on or upon someone or something

To rely or count on them or it, especially unduly.To take unfair advantage of (someone's good nature, etc).