1. (cause to) become completely full(使)裝滿;客滿
The lake is filling up after the heavy rain. 大雨之後湖水漲滿。
Please fill up the tank. 請把油箱裝滿。
She filled his glass up a second time. 她第2次給他斟滿了杯。
All the theatres were quickly filling up. 所有的劇院很快客滿了。
The vacancy in the office must be filled up. 辦公室的空缺必須補充。
2. complete sth. such as blanks,forms,etc. 填寫(空格、表格等)
I want you to fill up this form according to my instructions. 我想讓你按我的指示填寫這張表格。