makeweight

Something added on a scale in order to meet a required weight.

Something added only to fill a lack.

A counterweight; a counterbalance.

Something put in a scale to increase a weight already in it; hence, that which adds weight to something not sufficiently heavy; a thing or person of little account made use of merely to make weight or to fill a gap.

An adulterant, such as sand in sugar, used to increase the weight of a commodity.

That which is thrown into a scale to make weight; something of little account added to supply a deficiency or fill a gap.

Something of inferior quality which is included in a shipment to make up the weight.

Something included to add to the apparent weight or force of a argument.

a weight added to the scale to reach a required weight

anything added to fill out a whole