Snap up:

If you snap something up, you buy it quickly because it is cheap or is just what you want.

搶購，趕緊買下（便宜或心儀之物）

例句：

Every time we get a new delivery of clothes, people are queuing to snap them up.

每次新到一批服裝時，人們都在排起長隊來搶購。

Snap to it:

趕快

例句：  

You'll have to snap to it if you want to finish on time. 

要是想準時完成，你得抓緊時間！

Snap at somebody:

To speak or say something in an impatient, usually angry, voice

厲聲說；怒氣沖沖地說；不耐煩地說

例句： 

'Don't just stand there,' she snapped. 

“別光站在那兒?！彼鷼獾卣f。

Song for you（片尾曲）

Finneas - How It Ends