slacken：使松驰，使松散，放慢，减缓，萧条

slack,松懈的，-en,使。引申诸相关词义。

• fiasco
• fiat
• fib
• fiber
• Fibonacci series
• fibre
• fibril
• fibrillation
• fibrin
• fibrinogen
• fibro
• fibroid
• fibroma
• fibrous
• fibula
• fiche
• fickle
• fictile
• fiction
• fictionist
• fictionize
• fictitious
• fiddle
• fiddler
• fiddlesticks