Definition of come in

The phrase "come in" is a common expression used to invite someone to enter a specific place. The origin of the word "come" in this context can be traced back to the Old English verb "cumin", which meant "to come". This word eventually evolved into the Middle English "comen" and later, into the modern English "come". The word "in", on the other hand, is a preposition that signifies movement into a particular location. The expression "come in" thus combines these two words to create a simple and direct way to invite someone to enter a space. The usage of this phrase can be found in various contexts, such as in a shop or office when welcoming a customer or client, in a home when inviting someone inside, or in other settings where entering a specific location is appropriate.