Besom

the rendering of a Hebrew word meaning sweeper, occurs only in Isaiah 14:23 , of the sweeping away, the utter ruin, of Babylon.

A broom or sweep.

For I will rise up against them, saith the LORD of hosts, and cut off from Babylon the name, and remnant, and son, and nephew, saith the LORD. I will also make it a possession for the bittern, and pools of water: and I will sweep it with the BESOM of destruction, saith the LORD of hosts. ( Isaiah 14:22-23 )

a brush or broom of twigs for sweeping ( Isaiah 14:23 ) [E] indicates this entry was also found in Easton's Bible Dictionary

BESOM

be'-zum:

Occurs only once in Scripture: "I will sweep it with the besom of destruction" (Isaiah 14:23). Refers to what was in store for Babylon. The Hebrew word maT'ate', rendered "besom," is close of kin to the one (ti'te'thiha) rendered "sweep." In early English "besom" was synonymous with "broom," and is still so used in some parts of England.