'work on' definitions:

Definition of 'work on'

(from WordNet)
verb
To exert effort in order to do, make, or perform something; "the child worked at the multiplication table until she had it down cold" [syn: work at, work on]
verb
Shape, form, or improve a material; "work stone into tools"; "process iron"; "work the metal" [syn: work, work on, process]

Synonyms of 'work on'

From: Moby Thesaurus

Words containing 'work on'