广东
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
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