bare minimum
nounUK /ˌbeə ˈmɪnɪməm/
US /ˌber ˈmɪnɪməm/
The smallest amount of something that you need or must do.
He did the bare minimum of homework and went out to play.
OTHER MEANINGS
2. The simplest possible version of something, with nothing extra.
The bare minimum of a sandwich is just bread and cheese.
3. The smallest effort someone can make to still count as doing something.
She gave the bare minimum at practice but still showed up.
4. The lowest acceptable standard for a job or task.
Passing the test with a D is the bare minimum for this class.