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Related to splitting: splitting headache, splitting hairs
1. modifier Of or characterized by minute and irrelevant differences or details in an argument. There have been some hair-splitting changes to the script, but other than that, it's the same as it ever was.
2. noun The act of scrutinizing minute, irrelevant, or imperceptible differences or details. We would get a lot more done in these meetings if everyone did less hair-splitting.
make like a banana and split
humorous slang To depart or leave, especially at once or in a hurry. (A pun on "to split," a slang term meaning to leave or depart, and a "banana split," an ice-cream-based dessert featuring a banana halved lengthwise.) This carnival turned out to be really boring. Come on, let's make like a banana and split! A: "Where are Jeff and Sally?" B: "They needed to get home to feed the baby, so they made like a banana and split."
split (one's) sides
To laugh uproariously or hysterically. Your jokes are perfect for your speech tonight. You'll have them splitting their sides!
Fig. a severe headache, as if one's head were splitting open. I'm sorry, I can't. I have a splitting headache. Maybe Fred will play bridge with you. This splitting headache has been going on for hours.