A dependent, or affix, is a grammatical element that depends on the main word.

I attend the affiliated high school.

He trampled on my heart.

He inserts the book into the shelf.

Hiromu is my best friend.

He likes to wear new shoes.

He pinched his cheek and laughed.

I accompanied my friend to go see a movie.

The water in the lake has cleared up, and you can see to the bottom.

He is striving hard to pass the exam.