軽く何かをつまむを英語でなんと言うか？

手っ取り早く食べるときにはgrab a biteといいます。 0:02 it's lunch time for Patty and Kimberly. and after grabbing a quick bite, it's time for a little meditation.

https://www.youtube.com/watch?v=y1FsDHvbdDw  30:37 it's getting late. do you want to grab a bite?

参考リンク
https://www.youtube.com/watch?v=AzhycQ-CtOM  0:15 grab and sip a bottle of water