单词bracket-creep
网络: 税档潜升；等级攀升；税级爬档
Bracket creep: a shift of personal income into a higher tax bracket when the taxable income increases OVER time.
税档潜升：当应征税收收入增长一段时期后个人收入进入一个更高的纳税等级的变动。
Bracket creep is the phenomenon in which individuals move into higher tax brackets because of inflation.
支架蠕变的现象是，一个人进入更高的税级因为通货膨胀。