Wordnet 3.0
VERB (1)
1. 
 walk on and flatten; 
- Example: "tramp down the grass"- Example: "trample the flowers"[syn: tramp down, trample, tread down]
WordNet (r) 3.0 (2006):
tramp down
    v 1: walk on and flatten; "tramp down the grass"; "trample the
         flowers" [syn: tramp down, trample, tread down]