This is the 11398th most frequent French word.
relâchée
Relaxed or loosened.
Here, 'relâchée' is used as an adjective to describe the state of the guitar string as being loose or no longer taut.
La corde de la guitare était relâchée.
The guitar string was slack.
In this context, 'relâchée' implies a relaxation or loss of attention, used here as a verb in the past participle form to signify action performed.
Elle a relâchée sa concentration durant l'examen.
She lost focus during the exam.
Here, 'relâchée' is used in a passive voice, indicating that the guard was allowed to leave or set free.