Wordnet 3.0
VERB (1)
1. 
 cause to sag; 
- Example: "The children sagged their bottoms down even more comfortably"[syn: sag, sag down]
WordNet (r) 3.0 (2006):
sag down
    v 1: cause to sag; "The children sagged their bottoms down even
         more comfortably" [syn: sag, sag down]