To be secretive and evasive; to act surreptitiously and ambiguously.
他最近总是藏头亢脑地做事情，让人摸不着头脑，不知道他在计划些什么。
He has been acting secretively and evasively lately, leaving people puzzled and unaware of what he's planning.
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To be secretive and evasive; to act surreptitiously and ambiguously.