kip down
phr. v.. B2 Upper Intermediate Oxford
phr. v.. to sleep — an informal British way to say you're going to bed.
phr. v.. to sleep; informal British slang, typically used in colloquial speech; the particle 'down' is inseparable.
I'm going to kip down now.
After the long day, he decided to kip down early.
The weary traveler, having missed the last train, resolved to kip down in the corner of the station.
Usage
informal British English — avoid in formal contexts.
Teaching tip
contrast with 'get some sleep' (more general) and 'take a nap' (shorter rest); useful for teaching regional variation in sleep-related verbs.