guastare significa in inglese

go off▼(putrefy; become inedible)
verb
[UK: ɡəʊ ɒf] [US: ˈɡoʊ ˈɒf]

taint [tainted, tainting, taints]▼(To spoil food by contamination)
verb
[UK: teɪnt] [US: ˈteɪnt]