o·ver·sell 
(ō′vər-sĕl)
(ō′vər-sĕl)tr.v. o·ver·sold (-sōld), o·ver·sell·ing, o·ver·sells
1. To contract to sell more of (a stock or commodity) than can be delivered.
2. To be too eager or insistent in attempting to sell something to.
3. To present with excessive or unwarranted enthusiasm; overpraise.
over·sell′ n.