suck the air out of

verb2

1. •
   To dominate or overwhelm, preventing anything or anyone else from receiving attention.

   • “We spent time on learning facilitation skills in order to bring all voices into their conversations, to quiet those who tend to 'suck the air' out of ... — 2007
2. •
   To destroy; to cause to become lifeless and empty.

   • To hear that Mrs. Donnelly doesn't think I'm a good match for her son, and that Brennan wasn't thinking of me in those terms in the first place, sucks the air out of me like I'm a deflating balloon. — 2014