This is the 3393rd most frequent Spanish word.
desuso
The state of being unused or obsolete.
The word 'desuso' indicates in this context that these tools are no longer used for their original purpose and are now items of historical or cultural interest.
El museo expone herramientas que están en desuso hace décadas.
The museum displays tools that have been out of use for decades.
In this sentence, 'desuso' describes the process whereby cultural practices or customs are being abandoned or no longer observed.
Es lamentable ver tradiciones tan importantes caer en desuso.
It is unfortunate to see such important traditions fall into disuse.
The word 'desuso' here refers to the state of no longer being used or practiced by a group of people, specifically referring to language or terminology.