There's not a "-1 button" but you can block search results in a couple ways:

- Install the Personal Blocklist extension in Chrome: https://chrome.google.com/webstore/detail/nolijncfnkgaikbjbd...

- Click on a search result, then click back, and you'll see a "block example.com" for that snippet.

The first option is easy and always shows block links; the second option is server-side, so the blocks work on different browsers.