preparatory school work done outside school (especially at home)
"The student spent two hours doing prep before dinner to catch up on missed assignments."
Preparation.
"The doctor prescribed a daily dose of prep to protect against HIV before any potential exposure."
Acronym of pre-exposure prophylaxis.
In plain English: A prep is an informal term for something you need to do before starting your main task, like doing homework right after school so it's ready when class starts tomorrow.
"The band's lead guitarist plays with an impressive technique when he steps up to prep his guitar for the concert."
To prepare.
"Before the party, she spent hours prepping the food and decorating the hall."