cop (oneself) on

slang To stop acting like a fool; to begin using common sense or logic. Primarily heard in Ireland. Why on earth did you do that? You need to cop yourself on, Liam! She finally copped herself on and started acting like an adult for once. No one has time for these shenanigans, Nate, so cop yourself on already.

cop on

1. noun Common sense or basic logic. Sometimes hyphenated. Primarily heard in Ireland. It seems like no one in government has any cop on these days. A: "Todd really just put a pizza in the oven for 30 minutes without first turning it on." B: "Well, I've always doubted that he has any cop on." Have you no cop-on? Of course you have to wash your hands before you bandage a wound!

2. verb To wise up; to employ common sense or logic; to understand the situation. Primarily heard in Ireland. You really need to cop on to what's expected of you as an adult. We all copped on that we had overstayed our welcome. Of course you have to wash your hands before you bandage a wound! Geez, you need to cop on to basic hygiene!