1
general::
Phrase(s): take someone or something for granted
to expect someone or something to be always available to serve in some way without thanks or recognition; to value someone or something too lightly. • I wish you didn’t take me for granted. • I guess that I take a lot of things for granted.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
1. Consider as true or real, anticipate correctly, as in I took it for granted that they'd offer to pay for their share but I was wrong. [c. 1600] 2. Underestimate the value of, become used to, as in The editors felt that the publisher was taking them for granted.
American Heritage Idioms