verjuice
To render something sour; to embitter.
transitive
There are few names to which a jingle or a joke cannot be fitted—witness, Twining, banker and tea-dealer: / ‘Twining would be whining / Were’t not for his tea;’ / and the ex-Lord Mayor, Sir John Key, where the inherent rhyme to ‘donkey’ verjuiced the baronetcy.
Where it comes from
From Middle English verjous, vergeous, from Old French vertjus, verjus (French verjus), from vert + jus. First attested in c. 1302.
Adapted from the Wiktionary entry verjuice (CC BY-SA 4.0).