let sth slide ～をおろそかにする

If you let your work slide, you won't be able to make that promotion.

go to one's head うぬぼれさせる

Unfortunately, after he became famous Ted's success went to his head, and he began to behave very arrogantly. 　

I think I’d better stop complimenting you. It’s going straight to your head.

予定

Leave Wednesday open.　水曜日は空けといて。

Don't schedule anuything on Saturday. 土曜日には予定を何も入れないで。

Keep April open, ４月を空けておいてね。

Be panctual!　時間厳守！