Wordnet 3.0
VERB (1)
1. 
 come up (as of feelings and thoughts, or other ephemeral things); 
- Example: "Strong emotions welled up"- Example: "Smoke swelled from it"[syn: well up, swell]
WordNet (r) 3.0 (2006):
well up
    v 1: come up (as of feelings and thoughts, or other ephemeral
         things); "Strong emotions welled up"; "Smoke swelled from
         it" [syn: well up, swell]