Specialists in the field sometimes use the term "avoision" to refer to grey areas.
BBC: Ban 'insider' tax accountants from government - MPs
avoision:
Blend of avoidance +? evasion
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。