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tacit \ ˈtæsət \ adjective

understood or implied without being stated

心照不宣的；不言而喻的

expressed or carried on without words or speech

默示的；无言的

implied by conduct rather than in words

（行为所表明的）默许的，暗含的

词根记忆

tac-（沉默，无声）+ -it（形容词后缀）→ 不说出口的 → 心照不宣的，默示的

纽约时报原文

There is a tacit understanding in most offices that working longer hours is seen as a sign of commitment and ambition.

译文：在大多数办公室里存在一种心照不宣的共识—— 加班时长被视作敬业与上进心的体现。

外刊常见搭配

tacit agreement 默契；心照不宣的协议

tacit approval 默许

tacit consent 默示同意

tacit understanding 默契

例句

We have a tacit rule that no one checks work messages after 8 pm.

我们有一条心照不宣的规矩：晚上 8 点后不查看工作消息。

His silence was taken as tacit approval of the plan.

他的沉默被视为对该计划的默许