In conclusion, Ireland wasn't necessarily "overthrown," but the people of Ireland instead voted for an expansion in the coalition in their government. But, technically, they did have a change in their government, it just wasn't really what the main definition of "overthrown" is. As you can see, Ireland wasn't "overthrown" it was just voted against by its citizens.
A coalition is the variety in the amount of parties allowed to participate in elections.
So, in conclusion, for the second time, the people of Ireland "overthrew" their government with a democratic vote. The people of Ireland voted for an expansion in the coalition of their government. That means, it expanded which varieties of political parties that are allowed to compete in an election and/or be voted to be a government official.