inclined to secrecy or reticence about divulging information; "although they knew her whereabouts her friends kept close about it" 同义词：close, closelipped, closemouthed, secretive,
例句与用法
1.
He had remained tightlipped on the subject until saturday 星期六之前他对这件事一直守口如瓶。
2.
Authorities are remaining very tightlipped 官方仍然对此三缄其口
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