Meaning of flaming onion | Babel Free

Definitions

1. A 37 mm Hotchkiss revolving-barrel anti-aircraft gun used by the German army at the beginning of World War I.
   historical, slang
2. The flare or tracer ammunition fired by this weapon.
   historical, slang

Examples

“Allied pilots feared and loathed these, because a hit from a flaming onion instantly turned an aeroplane into an inferno.”

CEFR level