bombshell vs land mine

bombshell

noun
  • A bomb or artillery shell designed to explode on impact. 

  • Something that is very surprising, shocking, amazing or sensational. 

  • Someone who is very attractive; a sex symbol. 

land mine

noun
  • A mine that is placed on land and designed to explode when stepped upon or touched. 

  • A piece of exercise device consisting of a pivoting tube attached to the ground to which a barbell can be fitted to lift it off the ground. 

  • A critical subject or situation with concealed or unpredictable implications. 

How often have the words bombshell and land mine occurred in a corpus of books? (source: Google Ngram Viewer )