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

See also: descending, progressive

• Thursday
• thus
• thus far
• thusly
• thwack
• thwart
• thwarted
• thwarter
• thwarting
• thwartwise
• thy
• thylacine
• Thylacinus
• Thylacinus cynocephalus
• Thylogale
• thyme
• thyme camphor
• thyme-leaved sandwort
• thyme-leaved speedwell
• Thymelaeaceae
• Thymelaeales
• thymic
• thymic acid
• thymidine
• thymine