Their wedding was very hush-hush.
他们的婚礼非常秘密。
牛津词典
Apparently there's a very hush-hush project under way up north...
貌似这里往北的地方有个非常机密的项目正在进行。
They were desperate to keep the marriage hush-hush.
他们拼命想要瞒住这桩婚事。
Hush , hush , hush , hush, I smell a rat close by.
我闻到附近有老鼠的气味.
期刊摘选
She would drive away all ghosts and fears with her quiet " Hush , hush. "
她会平静地说: " 别响,别响, " 把所有的幽灵和恐怖的东西都赶走的.
飘（部分）
"clandestine intelligence operations"
"cloak-and-dagger activities behind enemy lines"
"hole-and-corner intrigue"
"secret missions"
"a secret agent"
"secret sales of arms"
"surreptitious mobilization of troops"
"an undercover investigation"
"underground resistance"