adj.having turned bad

Spoonable, soured non-dairy creams
Spoonable soured low-fat non-dairy creams
Japan, the system that soured
Japan, the system that soured :
'Home soured home?' Dislocation as a motif in the works of Martin Walser
The System that Soured: Toward a New Paradigm to Guide Japan Policy
Japan: The System That Soured: The Rise and Fall of the Japanese Economic Miracle
The System That Soured. The Rise and Fall of the Japanese Economic Miracle by Richard Katz
Brain tumors and artificial sweeteners? A lesson on not getting soured on epidemiology.
Desulfovibrio alaskensis sp. nov., a sulphate-reducing bacterium from a soured oil reservoir