1. 筋疲力尽：knock up against 碰撞 | knock up 筋疲力尽 | knock 敲

2. 赛前试打：lady tee女子发球区 | knock-up 赛前试打 | masters tournament 优秀选手赛

3. 码纸：knock off shower 冲网喷水管 | knock up 码纸 | knocker screen 振动除节机

4.

4. 敲门叫醒：knock over弄翻,打倒 | knock up敲门叫醒 | 19. rhyme n v 押韵,节奏

1. 草草做成（或建成）；匆匆拼凑成
    If you knock something up, you make it or build it very quickly, using whatever materials are available.

    e.g. Could you possibly knock me up some scrambled eggs?...
           你能尽快给我弄个炒鸡蛋吗？
    e.g. Any water-skiing enthusiast can knock up a pair of skis in a few hours.
           任何一个滑水爱好者都能在几小时内做成一副滑水橇。

2. 敲门唤醒
    If you knock someone up, you knock on the door of their bedroom or of their house in the night or in the morning in order to wake them up.

knock up的反义词

    e.g. He went to knock Rob up at 4.30am.
           他凌晨4:30去敲门唤醒罗布。

3. 使怀孕
    If a woman is knocked up by a man, she is made pregnant by him.

    e.g. When I got knocked up, the whole town knew it.
           我怀孕时，整个镇子都知道了。

1. make pregnant

    e.g. He impregnated his wife again

    Synonym: impregnatebang upprang up