Ask a chatbot what a word means and you get a clear, patient explanation in seconds. That part is genuinely useful. The problem starts after you close the tab.
An explanation lives in the conversation. A memory lives in you. Reading a definition once feels like learning, but recognition fades fast unless you do something with the word. The chat made the word make sense. It did not make the word stick.
What has to happen next is the unglamorous part: you have to meet the word again, from memory, spaced out over days. That is the work no explanation can do for you. Save the word somewhere it will come back to you, and the explanation finally pays off.