setback

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An unanticipated or sudden check in progress; a change from better to worse.
• noun A steplike recession in a wall.
• noun Any of a series of such recessions in the rise of a tall building.
• noun An automatically timed setting of a thermostat to a lower temperature, as in the home at night.

from The Century Dictionary.

• noun Any game in which a failure to score is counted by setting back the player instead of allowing his adversary to add the points to his score: usually restricted to games such as all-fours, in which there is bidding for the trump.
• noun Same as backset, 1.
• noun Same as backset, 2.
• noun A pool or overflow setting back over the land, as from a freshet.
• noun In architecture, a flat plain set-off in a wall.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Arch.) Offset, n., 4.
• noun United States A backset; a countercurrent; an eddy.
• noun Colloq. U.S. A reversal of progress in an endeavor; a reverse; a backset; a check; a repulse; a relapse.

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

• noun An obstacle, delay, or disadvantage.
• noun US The required distance between a structure and a road.
• noun architecture A step-like recession in a wall.
• noun possibly archaic A backset; a countercurrent; an eddy.
• noun A backset; a check; a repulse; a relapse.

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

• verb hold back to a later time
• verb cost a certain amount
• verb slow down the progress of; hinder
• noun structure where a wall or building narrows abruptly
• noun an unfortunate happening that hinders or impedes; something that is thwarting or frustrating