head over heels

head over heels also heels over head

1a. In a somersault; upside down; head first.

It was so dark Bob fell head over heels into a big hole in the ground.

Compare: UPSIDE DOWN.

1b. In great confusion or disorder; hastily.

The children all tried to come in the door at once, head over heels.

Compare: TOPSY-TURVY.

2.  {informal}

Completely; deeply.

He was head over heels in debt.