Definition of letter bombing in English:

letter bombing

noun

  • The action of sending a letter bomb; an instance of this.

Origin

1940s; earliest use found in La Crosse (Wisconsin) Courier Times. Originally from letter bomb + -ing. In later use also from letter-bomb + -ing.

Pronunciation

letter bombing

/ˈlɛtə ˌbɒmɪŋ/