devil float meaning

• [Engineering]
  "A hand float containing nails projecting at each corner and used to roughen the surface of plaster to provide a key for the next coat. Also known as devil, nail coat."

• They're joking around like old pals when the devil floats a wager : He believes humankind was God's biggest mistake, and if he can prove it, he gets to move back to heaven and run his operation from its more pleasant accommodations . ( Through the throne room's vast windows, we see that heaven is a vast, green golf course .)

• "devil float" meaning in Chinese: 常钉抹子
• "devil float" meaning in Russian: терка с гвоздями