and *black as a stack of black cats; *black as a sweep; *black as coal; *black as night; *black as pitch; *black as the ace of spades
completely dark or black. (*Also: as ~.) I don't want to go down to the cellar. It's as black as a skillet down there.Her hair was black as a stack of black cats.After playing in the mud all morning, the children were as black as night.The stranger's clothes were all black as pitch.
and *busy as a bee; *busy as a one-armed paperhanger; *busy as Grand Central Station; *busy as a cat on a hot tin roof; *busy as a fish peddler in Lent; *busy as a cranberry merchant (at Thanksgiving); *busy as popcorn on a skillet
very busy. (*Also: as ~.) My boss keeps me as busy as a one-armed paperhanger.I don't have time to talk to you. I'm as busy as a beaver.When the tourist season starts, this store is busy as Grand Central Station.Sorry I can't go to lunch with you. I'm as busy as a beaver building a new dam.Prying into other folks' business kept him busy as popcorn on a skillet.
Also, busy as a bee. Hardworking, very industrious, as in With all her activities, Sue is always busy as a bee, or Bob's busy as a beaver trying to finish painting before it rains. The comparison to beavers dates from the late 1700s, the variant from the late 1300s. Also see eager beaver; work like a beaver.