A more thorough explanation:

Definition: Sandpapering is a term used in the legal field to describe the process of a lawyer preparing a witness before a deposition or trial. This preparation can include going over potential questions and answers, reviewing documents, and discussing the witness's testimony.

Example: Before a trial, a lawyer may spend several hours sandpapering their client, a witness in the case. The lawyer may ask the witness questions about their testimony, review any relevant documents, and provide guidance on how to answer certain questions.

Explanation: Sandpapering is an important part of the legal process because it helps ensure that witnesses are prepared and confident when they testify. By going over potential questions and answers, the witness is less likely to be caught off guard during the deposition or trial. This can help the witness provide more accurate and reliable testimony, which can be crucial in determining the outcome of a case.