He dropped out of the race.

Used to indicate a reduction or removal of something.
She dropped out of school.
They dropped out of the meeting.
He dropped out of the conversation.
dropped out of college
dropped out of sight
dropped out of the program
withdrew
left
quit
She dropped the ball.

To let something fall or to fall down.
He dropped his phone.
The child dropped her toy.
They dropped the groceries.
dropped out
dropped off
dropped down
let fall
fall
tumble