The company plunged into crisis after the disappointing earnings report was released.

plunged 是动词 plunge 的过去式，plunge 的意思是"猛跌、骤降"。 into 是介词，表示"进入"。 plunge into 表示"突然陷入（某种困境或状态）"，常用于描述公司、市场等迅速陷入危机、债务或混乱等不良情况。