Meetings where decisions are made but no one wants to be accountable for them are the worst meetings. Keep that "action to decision" ratio low by ending every meeting with an "accountability summary" everyone gets afterwards, so everyone knows what they're responsible for. Image from wocintechchat.
You can approach this in a two ways. Either ask after each decision who will own the next steps, or note who owns each action item after a decision as the meeting progresses. If there are any decisions left at the end of the meeting that no one owns, ask who will own them (and ideally, not you!). Your overall goal is to have a one-to-one ratio of decisions made and clear actions to get those decisions rolling, so you don't wind up with another meeting where everyone looks at each other, wondering who was supposed to do that thing you discussed in the last meeting.