?offduty是一個由兩個單詞組成的短語，其中"off"是一個介詞，意為"從...離開"，"duty"是一個名詞，意為"責任、義務、工作"。因此，offduty的字面意思就是從責任或工作中離開。

在實際使用中，offduty通常指的是某人不在工作崗位上或不處于工作狀態下。這可能是因為工作時間已經結束、休息時間到了、休假中、或者其他原因導致暫時不需要履行職責。總之，offduty可以理解為不在承擔職責的狀態。

offduty的用法：

1. He is offduty now, so you can't reach him.

（他現在已經下班了，所以你不上他。）

2. The security guard was offduty when the theft happened.

（發生盜竊案時保安正好不在崗位上。）

3. I'm sorry, but the doctor is offduty at the moment.

（很抱歉，醫生現在不在工作狀態。）

4. The captain announced that all passengers should remain in their seats until the flight crew is completely offduty.

（機長宣布所有乘客應該坐在座位上直到機組人員全部下班。）

5. The police officer was offduty when he witnessed the accident, but he still took immediate action to help.

（在下班時目睹了事故，但他仍然立即采取行動幫助。）

例句參考：

1. Sheila was offduty for the weekend, so she decided to take a trip to the beach.

（Sheila周末不上班，所以她決定去海灘旅行。）

2. The firefighters were offduty when the call came in, but they still rushed to the scene to help.

（消防員在接到呼叫時已經下班，但他們仍然沖到現場幫忙。）

3. The restaurant is closed today because all the staff are offduty for a company outing.

（餐廳今天關門，因為所有員工都要參加公司的外出活動。）

4. After working overtime for several days, I finally have a day offduty tomorrow.

（連續加班了幾天后，我明天終于有一天休息時間了。）

5. The teacher reminded the students that they should not disturb her when she is offduty and enjoying her personal time.

（老師提醒學生，在她休息時間和享受個人時間時不要打擾她。）

offduty是一個常用的短語，可以指代各種離開工作狀態的情況。它可以用于口語和書面語中，并且在不同場合下可以有不同的用法和含義。使用時要根據具體情況來理解和運用。