Cut out for
〜にふさわしい，適した，向いている Wakana dances and sings well so I think she's cut out for Musical.
Figure
思う，推測する、だろうと思う Think, guess. I figured this study sheet would be easier for you to use.
Drop (him, her, them, us, me) a line
挨拶程度の手紙を送る Mako, please drop us a line when you're in L.A.
End up
する羽目になる，という結果になってしまう、てしまう、挙げ句の果て End up in big trouble 最終的に非常に困ったことになる You should study for test or you'll end up with a low score.
First thing
最初に Before anything else. After I get to school, I go to 英語研究室 first thing.
For nothing
水の泡(となった)無駄に I studied Japanese in the U.S. before I came to Japan, but when I got here I couldn't really speak or understand it. I thought that I had studied for nothing!
Fiddle with
いじる、いじくる I always see students fiddling with their smart phones on the train or in class.
Get a grip
しっかりする，落ち着く Americans often say this to themselves when they're really excited or nervous. For example, "Get a grip, Mark! You gotta make a presentation now!" You can say this to other people, but be careful because it's a little strong.
Get a load of
見て、凄くない？ "Get a load of that girl! Is she a hottie or what?"
Get away with
悪いことをしても、罰せられない、まんまとやってのける、咎められずにうまくやるの意味 Don't cheat on your tests because you might not get away with it.
Get it/Got it
分かる，分かった Understand. The teacher's lesson today was hard. I didn't get it, did you? Yeah, I got it.
Get kicked out
追い出される If you do something very, very bad, you might get kicked out of this school.
Give me a break
勘弁してくれ！We have to study six pages of idioms, Mark?? Come on, give us a break!!
Go ahead
どうぞ、(お)先にどうぞ You want to go to the toilet? Sure, go ahead.