Often used when referring to caring for someone's well-being or daily needs. She looks after her grandmother, making sure she eats well and stays active.
Pro Tip 2/3
Not Professional
Implies a more personal, informal responsibility than professional caretaking. Can you look after my cat over the weekend? I trust you more than a pet hotel.
Pro Tip 3/3
Temporary Duty
Suggests a temporary role of overseeing someone or something, not necessarily permanent. When the teacher steps out, the assistant will look after the class.