rabato

A rabato is money knocked off a price. The verb is rabati, to grant a discount, and the thing is usually given al a person and measured je a figure: rabato je dek elcentoj, ten per cent off. Do not reach for sxpari here - that is what the buyer does with the money afterwards, not what the seller does to the price.

Now the seam, because this word has two of them and both are false. It looks like rabi, to rob, plus the passive participle -at-, and Esperanto really does build nouns that way: an -ato is the one being acted on, so rabato ought to decode as the person currently being robbed. It does not, and a discount is not a robbed thing. Rabat- is one borrowed root and nothing peels off the front of it.

The second seam is the interesting one, because the etymologies do not even share a continent. Esperanto rabi is Germanic - German rauben, the same family as English rob and reave. Rabato is Romance, from Old French rabattre, to beat back down, which is where English gets rebate and abate. Two unrelated roots that happen to collide in five letters. And yet the picture the false seam paints is not far off: a rabato genuinely is a price being beaten downwards. The image is honest even though the grammar is a fiction.