PHRASAL VERB "to know something / someone inside out"

Hello English-language lovers!

For today's column, let's talk about the expression 'to know something / someone inside out'.

This phrasal verb 'to know something / someone inside out' means to know the person or place or thing really, really well.

She knows Italy inside out. She has been living there for more than 20 years.
I know English grammar inside out.

We can also use 'know something / someone like the back of your hand' with the same meaning.

STORY

Emily and Mark had been best friends since kindergarten. They knew each other inside out, sharing their dreams, fears, and secrets. One summer, they embarked on a road trip, hoping to explore the country together. As they traveled from state to state, they discovered new places and faces, but their bond remained unbreakable.

One night, while camping under the starry sky, Emily turned to Mark and said, "You know, I thought I knew you inside out, but this journey has shown me new facets of your personality." Mark grinned and replied, "Funny, I was going to say the same thing about you. We may know each other inside out, but there's always something more to learn." And as they lay under the twinkling stars, they realized that their friendship, like the open road ahead, held endless possibilities for exploration.