punctuate in WordNet English dictionary

1. to stress, single out as important
   "Dr. Jones emphasizes exercise in addition to a change in diet"
   stress  emphasize  emphasise  punctuate  accent  accentuate 
   
2. insert punctuation marks into
   punctuate  mark 
   
3. interrupt periodically
   "Her sharp questions punctuated the speaker's drone"
   punctuate