upside down Definition

upside down
adj

1. With the top part at the bottom; upturned or inverted.

Thesaurus: overturned, upset, topsy-turvy, upturned, inverted.
2. colloq
In complete confusion or disorder.
Example: The room was completely upside down half an hour ago
Thesaurus: chaotic, jumbled, disordered.

adverb

1. In an inverted way or manner

Example: Why does buttered toast always fall upside down on the floor?
2. In a completely confused or disordered way.

Etymology: 14c as up so doun or upsedoun, perhaps with so meaning ‘as if'.