This is an older feature that Google Adwords used to have but took away from us for some unknown reason but according to the Adwords blog, advertisers are now able to pause specific keywords rather than having to delete them and add them back.

As of today, all AdWords advertisers can pause and resume keywords (for keyword-targeted campaigns), sites (for site-targeted campaigns), and ad creatives. As you can see from the picture below, this feature is functionally similar to the pause/resume feature on the Campaign Summary page – we’ve simply extended it to the keyword, sites and ad
variations tabs.

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