1. To reside in a house, apartment, etc., underneath someone or something. We actually live under an elevated light rail track. It was really affordable, but the noise is nearly unbearable. I live under an artist, and I barely ever hear a peep out of her.
2. To have one's life ruled or dictated by someone or something. We've been living under this dictatorship for over a decade, so many people have simply become used to it at this stage. After living under such extreme austerity measures for so many years following the financial crisis, it feels like the economy is positively booming now in comparison.
3. To be constantly aware of, threatened by, or worried about some source of stress or concern. I just can't understand healthcare system that forces so many people to live under lifelong debt simply because they required medical treatment. Living under the constant threat of war has made us all extremely cynical and distrustful.
live under someone or something
to dwell directly beneath someone or something. We live under the Johnsons. They are fairly quiet. We lived under a law office for a few years.
live under something (negative)
to exist under some kind of worry or threat. I can't continue to live under the threat of bankruptcy all the time. It is hard to live under the worry of another war.