Simple past tense and past participle of ostracize.(verb)
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Use "ostracizing" in a sentence
"Henry is furious with Isabella, yet Harriet is the one who leads the family in ostracizing her."
"It's not much of a leap thereafter--especially given how broadly you're apparently defining "ostracizing"--to chide particular, and particularly egregious, examples of theocratic overreach elsewhere."
"It's moving a bit too closely into, say, X-Men territory in terms of the idea of ostracizing people based on their status, but I'm no comic book fan and I think it has some dramatic potential regardless of the likely plagiarism."