Fetching details from the dictionary...
to carry (something) under cover; to carry concealed
容疑者はナイフを隠し持った。
The suspect had carried a knife concealed.
旅行者は現金を隠し持っているとみられる。
The traveler is believed to be carrying concealed cash.
スパイはネットワークを暴露する機密文書を隠し持つ。
A spy carries confidential documents that could expose the network.