This is the 11397th most frequent French word.
relâcher
To release or to relax.
In this sentence, 'relâcher' is used to mean 'release' or 'let go', referring psychologically relaxing or easing pressure.
Il faut relâcher la pression pour se détendre.
You need to release the pressure to relax.
Here, 'relâcher' is used to denote 'release' in the physical sense, such as freeing someone from captivity.
Les gardes ont décidé de relâcher le prisonnier.
The guards decided to release the prisoner.
In this case, 'relâcher' refers to 'relax' or 'loosen' in a physiological context, describing the action of muscles relaxing.