Does Google de-index individual pages or entire sites?

Does Google de-index individual pages or entire sites?

Everyone knows that Google can de-index an entire site, but could they also just de-index specific pages that they find objectionable? Sometimes back, I was reading how Bing uses this strategy to remove overly optimized pages that get high bounce rate from the Bing search engine. These specific pages are considered irrelevant to search results anyway.