To donate something you want to throw away

Suppose that a person buys a packet of sugar. On the way home, the packet falls off his hands and the sugar scatters on the ground. Nobody is expected to gather the sugar again, but that person does so; of course not for his own use anymore, but to donate it to the poor! Obviously, if the packet hadn't fallen down, he wouldn't have decided to donate it. It goes without saying that this kind of donation and charity is morally worthless and not considered a good deed. Is there any English idiom to describe this kind of charity or donation? Thanks in advance.

castoffs

The type of charity described in the original question occurs on a country-wide scale sometimes. Recently, an EU member donated a large shipment of medicines to our local General Hospital; however, when it came time to distribute them, it was realized they were already expired.

There is a word to describe this type of donation of unwanted materials: they are cast-offs.

things, usually clothes, that you no longer want:

-Cambridge Dictionary online

Cast-offs usually refers to old clothes which are given to poor relations or dumped in those large bins outside churches in the US, but the word could also be used to describe any unwanted item that is given away. A synonym is reject.

Cast-offs are not usually rejected for being out-of-date in the third world: here old clothes are sold in Mega-pacas and clothe the majority of the poor people.

By way of contrast, I heard that some US food chains are donating what they used to call “waste”:

...food that passes the restaurant-issued freshness date but is still entirely wholesome and edible by FDA standards is packaged, labeled and sent off to community organizations that feed the hungry, such as after-school programs, day cares, transition homes and rehabilitation centers.

Some seek to go even further, donating left-overs and table gleanings.

“Demeaning” depends on your point of view. The morality of charity is not always clearly marked, and hunger may have its own sharply divided politics, but the unkindest cut of all is keenly felt as the constant daily pang of hunger in the bellies of at least 1/3 of the children of the world.

EDIT...................................................................

Comments often disappear or go unpunished. I am now including [these] as they seem to be relevant, especially in our pandemic times...

One of the most heart-wrenching things I have witnessed in my life was near the end of the war when a delivery truck lost a case of eggs off the tailgate in the street, and the street-kids gathered round to scoop up the gooey mess and lick it off their fingers. It was probably the most nutritious thing they had to eat that week.

As John Lawler observed:

>The unwashed masses don't have lefovers.

https://english.stackexchange.com/questions/550547/what-is-the-opposite-of-leftovers?noredirect=1#comment1355020_550547

salvage describes both the OP and the comment scenario. You rescued the sugar from waste, and extracted some residual utility if not your full value. Same with the evening duration with girlfriend or brother: you rescued it from waste, and extracted some residual utility if not your full value.

Miriam-Webster salvage

• the act of saving something (such as a building, a ship, or cargo) that is in danger of being completely destroyed

• something (such as cargo) that is saved from a wreck, fire, etc.

• something extracted (as from rubbish) as valuable or useful

The only idiom that I can think of is One man's trash is another man's treasure which means:

Prov. Something that one person considers worthless may be considered valuable by someone else.

[McGraw-Hill Dictionary of American Idioms and Phrasal Verbs]

The man offloaded the dirty sugar by donating it to the poor.

to offload — (transitive) to get rid of things, work, or problems by passing them on to someone or something else. He offloaded the defective car onto an unsuspecting buyer. – Meaning #2 from https://en.m.wiktionary.org/wiki/offload

There's a neologism, not in any dictionary, that's gaining traction and that is "freecycle".

Rather than dispose of something unwanted, you freecycle it and someone who wants it takes it off your hands.

It has, in large, been driven by the freecycle website.

_{I have no affiliation with said website.}