WILL-O'-THE-WISP Meaning of WILL-O'-THE-WISP in English [will-o'-the-wisp] n [Will (nickname for William) + of + the + wisp] (1661) 1: ignis fatuus 1 2: a delusive or elusive goal -- will-o'-the-wisp adj Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012