A part of the wall that is made to remove (e.g., a Pesach kitchen).
הכנה לחול (Preparations for a Weekday): Is There a Limit to the Amount of Exertion Used When Doing the Action?;
A Small טירחא (Tircha, Minor Exertion) to Protect Items From Getting Ruined;
Understanding the concept of "הפסד" (paying for losses).