'neaten' definitions:

Definition of 'neaten'

From: WordNet
verb
Put (things or places) in order; "Tidy up your room!" [syn: tidy, tidy up, clean up, neaten, straighten, straighten out, square away]
verb
Care for one's external appearance; "He is always well- groomed" [syn: groom, neaten]

Synonyms of 'neaten'

From: Moby Thesaurus