Waste allowance is a term used to describe the amount of waste that is allowed to be produced by a company or individual. It is usually measured in terms of weight, volume, or other units. The two crossword solutions for this term are TRET (4 letters) and TARE (4 letters). TRET stands for Total Residual Excess Tonnage, which is the total amount of waste that is allowed to be produced. TARE stands for Total Allowable Residual Excess, which is the amount of waste that is allowed to be produced after taking into account any recycling or reuse of materials.