To search for something that one already possesses, or for something that is right in front of them; to be oblivious to what is at hand. It can also refer to holding one position while looking for a better one, though this meaning is less common now.
他找了半天钥匙，结果发现钥匙就挂在自己腰上，真是骑牛觅牛啊
He searched for his keys for a long time, only to find them hanging on his own waist; it was truly a case of looking for an ox while riding it.
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