Definition:
The phrase "walk in" is a verb that means to enter a place by walking, often without any special preparation or announcement.
Walk in on someone: This means to unexpectedly see someone doing something, especially when they are not prepared for you to see it.
Walk in the park: This idiom means something is very easy to do.
"Walk in" is a simple yet useful phrase that describes the act of entering a place by walking. It can be used in casual settings or more formal situations, and it can also be adapted into different forms or combined with other phrases for varied meanings.