A head-scratcher informal countable noun
Used to describe something that is difficult to understand.
The plane disappeared, which was a really head-scratcher. Nobody could explain it.
I think we need to have more time to find a solution. It's a head-scratcher.
To punish someone or something harshly
Once something has been done, you can do nothing but face the consequences.
White lie
Act in a way that is likely to cause problems for you
Barten Holyday (1593–1661), a Church of England clergyman and poet, was the first to use the term in the early 17th century.