fly agaric
noun [ C ] uk/ˌflaɪ ˈæɡ.ə.rɪk/ us/ˌflaɪ ˈæɡ.ɚ.ɪk/
毒蝇伞（一种有毒的蘑菇，红色带白色斑点，食用后会产生幻觉）
a type of poisonous mushroom that has a red top with white spots on it. When eaten it can cause hallucinations (= make you see things that are not real).