1. Going down by steps 
2. (of taxes) gradually decreasing in rate on sums below a certain amount

See also: descending, progressive

• gray kingbird
• gray lemming
• gray market
• gray matter
• gray mullet
• gray partridge
• gray polypody
• gray poplar
• gray sage
• gray sea eagle
• gray skate
• gray snapper
• gray sole
• gray substance
• gray whale
• gray willow
• gray wolf
• gray-black
• gray-blue
• gray-brown
• gray-green
• gray-haired
• gray-headed
• gray-leaf pine
• gray-pink