come along in WordNet English dictionary

1. develop in a positive way
   "He progressed well in school"; "My plants are coming along"; "Plans are shaping up"
   progress  come on  come along  advance  get on  get along  shape up 
   
2. come into being or existence, or appear on the scene
   "Then the computer came along and changed our lives"; "Homo sapiens appeared millions of years ago"
   appear  come along 
   

come along in English Wiktionary