letter bomb 
noun
An explosive device hidden in a small package and sent to someone with the intention of harming or killing them: [as modifier]: letter bomb attacks...
- On the letter bomb front, army bomb disposal experts were called on to disarm a letter bomb sent to an unnamed agricultural business and a farm.
- The identity of the American Unabomber was assisted by the analysis of saliva left on a letter bomb he sent that did not explode.
- Four weeks ago, a letter bomb addressed to Mr Attwood was sent to the Belfast headquarters of the Policing Board.
- get in
- get in on
- get in on the ground floor
- get in there
- get in with
- get it in one
- get it on
- get it up
- get knotted
- get laid
- get lost
- get lucky
- get moving
- get nicked
- get no change out of
- get off
- get off at Redfern
- get off on
- get off one's arse
- get off one's bike
- get off the dime
- get off the ground (or get something off the ground)
- get off the mark
- get on
- get one's act together