The term 'THING TO FULFILL' can be summarized as a NEED that must be met. This NEED could be anything from a requirement for a job, to a task that needs to be completed, or even a desire that must be satisfied. The four letter solution to this crossword is 'NEED', which implies that something must be done in order to fulfill the requirement. This could be anything from finding a job to completing a project, or even just satisfying a personal desire. In any case, the term 'THING TO FULFILL' can be summarized as a NEED that must be met in order to achieve a desired outcome.