This is the 2359th most frequent Japanese word.
オフ
"オフ" (ofu) means "off" or "not active," often referring to a break, time off, or something being turned off.
The word 'オフ' here refers to switching off or stopping work-related activities.
休みの日には、仕事をオフにすることが大切です。
On days off, it's important to turn off work.
In this sentence, 'オフ' is used as part of 'offline', indicating a mode that does not require internet connectivity.
そのゲームのオフラインモードはとても楽しいです。
The offline mode of that game is very enjoyable.
Here, 'オフ' refers to the action of switching off a device or appliance, specifically a light.