Simple past tense and past participle of slabber.(verb)
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Use "slabbered" in a sentence
"How did he use to hang, till he slabbered again, poor doting old man! on your silver tongue!"
"“A hadden tongue,” replied Andrew, “makes a slabbered mouth.”"
"And then lest the southrons should escape we have a reference to the “beastly habit of drinking from a tankard in which perhaps a dozen filthy mouths have slabbered as is the custom in England.”"