I am reading the following definition of commit
1c. to consign or record for preservation. Example: commit it to memory
Now I am trying to understand the word "consign" in the above entry.
Here are the choices for "consign":
1: to give over to another's care
2: to give, transfer, or deliver into the hands or control of another; also : to commit especially to a final destination or fate (a writer consigned to oblivion)
3: to send or address to an agent to be cared for or sold
Why do none of these definitions fit perfectly? In English am I supposed to invent my own figurative meaning to make it fit?