What is did meaning?

"Did" is the past tense of the verb "do" and is used to describe an action or event that has already happened in the past. It can also be used to form questions or negative sentences in the past tense. For example, "I did my homework" means that you completed your homework at some point in the past, while "Did you do your homework?" is a question inquiring whether someone has completed their homework. "I did not go to the party" refers to an action that did not occur, while "Did she not go to the party?" is a negative form of the question inquiring whether she attended.