faiblir

[fɛbliʀ]
verbe intransitif
1) (perdre de sa force) to get weaker
ma vue faiblit — my eyesight is failing
2) (perdre de sa fermeté) to weaken
3) (baisser de niveau) [sportif] to flag; [roman, jeu] to decline; [mémoire] to fail; [attention, envie] to wane; [espoir] to fade; [rendement] to dwindle; [vitesse] to slacken
quel humour, ma parole, tu faiblis! — (colloq) that wasn't very funny, I think you're losing your touch!
4) (diminuer d'intensité) [pluie] to abate; [bruit] to grow faint; [éclairage] to grow dim