take for granted
take for granted {v. phr.}
1. To suppose or understand to be true.
Mr. Harper took for granted that the invitation included his wife.
A teacher cannot take it for granted that students always do their homework.
Compare: BEG THE QUESTION.
2. To accept or become used to (something) without noticing especially or saying anything.
George took for granted all that his parents did for him.
No girl likes to have her boyfriend take her for granted; instead, he should always try to make her like him better.
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Source: A Dictionary of American Idioms