Kenneth G. Wilson (1923–). The Columbia Guide to Standard American English. 1993.
plunge (n., v.)
When the verb plunge combines with a preposition, it can take into, in, to, toward, through and other directional words, such as under, over, and the like: She plunged into her work. The baby was plunged in the bath. He plunged to his death; She plunged through the wheat toward the overturned tractor. The noun can combine with an equally long list of prepositions: a plunge into [in] the pool, toward [to] the bottom, under [beside] the raft, after [before, during] work, etc.
