overstress Syllabification: (o·ver·stress)Pronunciation: /ˌōvərˈstres/Definition of overstress verb [with object] subject to too much physical or mental stress:they are prone to nervous breakdowns if overstressed lay too much emphasis on:the value of good legal assistance cannot be overstressed noun excessive stress. overstress in other Oxford dictionaries Definition of overstress in the British & World English dictionary