at a (single) blow

All at once, with a single decisive or powerful action. When the economy crashed, thousands of people lost their jobs, their homes, and their pensions at a single blow. As the two leaders ratified the treaty, 10 years of civil war ended at a blow.

Common Names:

Name	Pronounced	Usage
Anan (1)	-	Western African, Akan
Aludra	-	Astronomy
Gazsi	GAW-zhee	Hungarian
Isolde	i-ZOL-də (English), i-SOL-də (English), ee-ZAWL-du (German)	English (Rare), German, Arthurian Romance
Ivor	IE-vawr (English), EE-vawr (English)	Irish, Scottish, Welsh, English (British)
Lugus	-	Celtic Mythology