on the sly

副词 on the sly:

1. in a furtive manner
   同义词：furtively

1. Read it, if at all, on the sly, to look for their names.
   (要看的话就偷偷地看，去找一找他们的名字。)
2. He's been drinking whiskey on the sly for thirty years.
   他暗中偷喝威士忌酒已有三十年了。
3. She must have been having lessons on the sly.
   她准是暗地里一直在上课。
4. Many people attended the meeting on the sly.
   许多人秘密地参加了会议。