I am planning to build an online web app and a mobile app for learning vocabulary.


Functions:
- User can create lists (eg. personalities, phrasal verbs etc.) and add words to the list with definitions.
- These list can be made public.


If users were to copy dictionary definitions, for instance Oxford or Cambridge) and make the word lists public, is it a copyright infringement? Am I responsible for this activity? Can dictionary owners charge me against copyright issue?



Copyright infringment: using dictionary definitions