sign off on; sit up; sleep out; sleep together

sign off on +
正式同意 (某事)
The CEO signed off on the plans to increase the number of foreign workers. (執行長正式同意增加外勞人數的計畫)

sit up
感興趣;驚訝
I sat up when he told me he was closing the company. (當他告訴我他將關閉公司時我感到驚訝)
The news that the president was taken ill suddenly really made us sit up. (總統突然病倒的消息著實讓我們大吃一驚)

sit up
坐直
I have told you many times to sit up straight. (我已經告訴你很多次要坐直)

sleep out
在戶外睡覺
It's so hot tonight so we've decided to sleep out in the garden. (今晚太熱了,所以我們決定到外面花園去睡)

sleep out
夜不歸宿,不在家裡過夜
Mary and her husband are always going to clubs and seem to sleep out nearly every night. (瑪麗和她先生老是上夜店,幾乎每個晚上都不在家裡過夜)

sleep together
(兩人) 睡在一起,發生性關係
I don't think Amy and Randy sleep together any more. (我認爲艾美和蘭迪兩人已不在一起了)

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