B1
to behave in a particular way
Dictionary examples:
The new employee acts like a boss, telling everyone what to do. (0.0)
The teacher acts like a comedian to keep the students awake during math class. (0.0)
My grandpa acts like a teenager when he plays video games with me. (0.0)
Don't be so silly - you're acting like a child! (24.8)
He acted as if he'd never met me before. (62.1)