el reposacabezas - headrestSpanish example: A pesar de que su eficacia está demostrada, generalmente usamos mal nuestro reposacabezas.
English example: Despite the fact that their effectiveness has been shown, generally we don't use our headrests correctly.
Source: el reposacabezas - headrest (https://www.123teachme.com/spanish_feeds/word_of_the_day/2023/1/10)