cut the nails
The phrase 'cortarse las uñas' in Spanish translates to 'cut the nails' in English. This is usually used in the context of personal grooming, where one trims the nails on their fingers or toes. Spanish-speakers would use 'cortarse las uñas' to say that they're going to cut their nails or that someone needs to cut their nails. Like in English, this can be used literally or figuratively to suggest tidying up or getting rid of something unnecessary.
It is necessary to cut your nails regularly.
In this sentence, 'cortarse las uñas' is used to express the idea of personal hygiene and care. It suggests that one should frequently trim their nails as part of maintaining good hygiene.
I have forgotten how to cut nails correctly.
This sentence uses 'cortarse las uñas' to discuss a skill or ability. The speaker is expressing that they have forgotten the correct method of nail trimming, possibly indicating that it's been a long time since they last did it.
If you want to play the guitar, you should not cut your nails too much.
In this sentence, 'cortarse las uñas' is associated with a particular activity - playing the guitar. Many guitarists keep their nails longer to strum or pick the strings more easily. Hence, the need to control how much one trims their nails.