ravel แปลว่า

The verb is borrowed from Dutch ravelen, rafelen (“to tangle, become entangled; to fray; to unweave”) [and other forms]; further etymology uncertain. It has been suggested that the verb is originally derived from the noun, but the Oxford English Dictionary regards this as “very uncertain”, and instead regards the noun as having derived from the verb (compare Dutch rafel, raffel (“frayed thread”)). Ravel is a contranym having both the senses of tangling (verb senses 1.1, 1.2, 1.4.1, and 2.3; noun sense 1) and untangling (verb senses 1.3, 1.4.2, 1.4.3, 2.1, and 2.2; noun sense 2). It would appear that the tangling senses predate the untangling ones (as in Dutch), but this is uncertain because the first published uses of both senses of the words occur around the same time.