/
ɪnˈgrəʊs, 
ɛn-/
v.
  - 
(often be engrossed in)
 absorb all the attention of. ▸archaic monopolize. 
- Law  produce (a legal document) in its final form.
Derivative
- engrossing adj.
- engrossingly adv.
Etymology
ME: sense 1 is from OFr. en gros, from med. L. in grosso ‘wholesale’; sense 2 is from Anglo-Norman Fr. engrosser, med. L. ingrossare (from OFr. grosse, med. L. grossa ‘large writing’).