Come by : Visit

I’ll COME BY after work and see if you need any help.

Come about : Happen, occur

The meeting CAME ABOUT because both sides were sick of fighting.

Come apart : Break into pieces

It CAME APART when I tried to lift it off the floor and I had to glue it back together.

Come round : Become conscious, wake up from anaesthetic

She CAME ROUND and learned that the operation had been a complete success.

Come up with : Think of a solution, excuse, etc.

Nobody could COME UP WITH a satisfactory explanation for the accident.