N'eva-sekha-n'āsekha: 'neither in training nor beyond training', i.e. neither learner nor master. Thus is called the worldling puthujjana, for he is neither pursuing the 3-fold training sikkhā in morality, mental culture and understanding, on the level of the first 3 paths of sanctity, nor has he completed his training as an Arahant.
Maha Thera Nyanatiloka. Manual of Buddhist Terms and Doctrines, Buddhist Publication Society, first edition 1952.