The word "kip" meaning "to sleep" comes from the Middle Dutch word "kippen", which means "to nap" or "to doze". The word was first used in English in the 16th century, and it is thought to have been brought to England by Flemish weavers. The word is still used in some parts of England today, and it can also be found in the dictionaries of other languages, such as German and Dutch.
In addition to its literal meaning of "to sleep", the word "kip" can also be used figuratively to mean "to take a break" or "to relax". For example, someone might say "I'm going to kip for a while" to mean that they are going to lie down and rest. The word can also be used to describe a place where people sleep, such as a "kip house" or a "kip van".