from The American Heritage® Dictionary of the English Language, 4th Edition
- transitive v. To pass through; experience: a house that is undergoing renovations.
- transitive v. To endure; suffer: undergo great hardship.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To go or move under or beneath.
- v. To experience; to pass through a phase.
- v. To suffer or endure; bear with.
from the GNU version of the Collaborative International Dictionary of English
- transitive v. To go or move below or under.
- transitive v. To be subjected to; to bear up against; to pass through; to endure; to suffer; to sustain.
- transitive v. To be the bearer of; to possess.
- transitive v. To undertake; to engage in; to hazard.
- transitive v. To be subject or amenable to; to underlie.
from The Century Dictionary and Cyclopedia
- To go or move under or beneath. To bear up against; endure with firmness; sustain without yielding or giving way; suffer; bear; pass through: as, to undergo great toil and fatigue; to undergo pain; to undergo a surgical operation.
- To be subjected to; go through; experience: as, to undergo successive changes.
- To be the bearer of; partake of; enjoy. To undertake; perform; hazard. To be subject to; underlie.
- To endure trial, pain, or the like with firmness; bear up against evils.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- v. pass through
From Middle English undergon, from Old English undergān ("to undergo, undermine, ruin"), equivalent to under- + go. Cognate with Dutch ondergaan ("to undergo, perish, sink"), German untergehen ("to perish, sink, undergo"), Swedish undergå ("to undergo, go through"). (Wiktionary)