To get the better of

to obtain an advantage over; to surpass; to subdue.

See also: Get

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
There are four paragraphs, starting with the one where he accuses Richard Perle and David Frum of allowing "their pro-Israel prejudices to get the better of their judgment." I don't know if that is true or not; I haven't read their book.