fall over

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb intransitive, idiomatic To fall from an upright or standing position to a horizontal or prone position.
• verb intransitive, idiomatic Of an argument, to fail to be valid.
• verb intransitive, idiomatic, informal, computing Of a computer program or system, to crash.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb fall forward and down