You can suspend the display of ad group for a specific keyword. In this case, the statistics collected for this keywork will be saved.
Impressions for a group of ads can be suspended for a specific keyword on the campaign page in the phrase editing section:
You can also suspend any active phrases. After suspension, the phrase will be highlighted in pale blue.
Statistics (accumulated CTR) on the suspended phrases will be stored for 28 days starting from the moment of suspension, after that it will be reset to zero. However, the phrase can be enabled after this time has elapsed.