dip into
dip into {v. phr.}
1. To scan or sample lightly and briefly (said of printed materials).
I didn't get a chance to read all of War and Peace, but I dipped into it here and there.
2. To take money out of a savings account or a piggy bank.
I am sorry to have to say that I had to dip into the piggy bank; I took out $6.75.
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Source: A Dictionary of American Idioms