1. 照料；照顾；照管
If you look after someone or something, you do what is necessary to keep them healthy, safe, or in good condition.

2. （尤指作为工作）料理，打理
If you look after something, you are responsible for it and deal with it or make sure it is all right, especially because it is your job to do so.

1. keep under careful scrutiny

e.g. Keep an eye on this prisoner!