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

• Lexulous
• Wordscraper
• Wordosaur

n. The act or process of slowing down; a slackening of pace: a production slowdown.

n. A reduction in speed, or a decrease in the level of production, etc.

n. the act of slowing down or falling behind

"The maker of industrial goods from controls to tools market cap $37 billion is a bellwether as the word slowdown creeps into parlance in unsettling ways, especially as politicos yammer about the U.S debt cap."

holdup    delay   

slow down   

abatement    diminution    retardation    cutback   

godown    hoedown    lowdown    showdown   

downturn    recession    downgrade    stagflation    slump    setback    meltdown    shortfall    deflation    decline