Meaning

1. to know how, to be able to, can (to have enough skill, strength, means, or ability to do something) [+infinitive = to do what]
2. to be able to, can (to be designed for something) [+infinitive = to do what]
3. to be able to, can (to do something regularly, usually considered negative by the speaker) [+infinitive = to do what]
4. to be able to, can (to go to certain limits in one's behavior or to reach a certain state) [+infinitive = to do what]