This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. An unanticipated or sudden check in progress; a change from better to worse.

n. A steplike recession in a wall.

n. Any of a series of such recessions in the rise of a tall building.

n. An automatically timed setting of a thermostat to a lower temperature, as in the home at night.

n. An obstacle, delay, or disadvantage.

n. The required distance between a structure and a road.

n. A step-like recession in a wall.

n. A backset; a countercurrent; an eddy.

n. A backset; a check; a repulse; a relapse.

n. Offset, n., 4.

n. A backset; a countercurrent; an eddy.

n. A reversal of progress in an endeavor; a reverse; a backset; a check; a repulse; a relapse.

n. Same as backset, 1.

n. Same as backset, 2.

n. A pool or overflow setting back over the land, as from a freshet.

n. In architecture, a flat plain set-off in a wall.

n. 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.

v. hold back to a later time

v. cost a certain amount

v. slow down the progress of; hinder

n. structure where a wall or building narrows abruptly

n. an unfortunate happening that hinders or impedes; something that is thwarting or frustrating

"Sir Alex Ferguson believes the Champions League carrot will inspire a United revival after the title setback against Chelsea."

cost    be    impede    hinder    structure    construction    occurrent    happening    occurrence    natural event   

whammy   

backset    countercurrent    eddy    reverse    check    repulse    relapse    revers   

netback   

drawback    downturn    impediment    rebuff    breakthrough    frustrations    gaffe    disruption    defeat    blunder