The word 陷入 is formed through the combination of two characters, each contributing a core physical action to create a unified metaphorical concept. The first character, 陷, depicts falling into a pit or hollow, conveying a sense of sinking or being trapped. The second, 入, simply means to enter or go into. When combined, the sequence 陷-入 visually and conceptually maps the process of first sinking down and then entering fully into that state, resulting in the comprehensive meaning of "to fall into", "to be caught in", or "to plunge into" a condition, typically an abstract or undesirable one.