1. come by - Verb
2. come by - Interjection
obtain, especially accidentally
visit informally and spontaneously
Source: WordNetThere is no shortage of good days. It is good lives that are hard to come by. Annie Dillard
In life, all good things come hard, but wisdom is the hardest to come by. Lucille Ball
Good fiction is made of that which is real, and reality is difficult to come by. Ralph Ellison
Deficiencies come by the kilo and go by the gram. Ukrainian Proverb
How you come by it no one asks; but wealth you must have. Latin Proverb
When thieves fall out, honest men come by their own. Spanish Proverb