1
general::
Phrase(s): Now what? [and] What now?
Inf. What is going to happen now?; What kind of new problem has arisen? • The phone rang again, and Tom said, rising from the chair, "Now what?" • Bob: There’s a serious problem—sort of an emergency— in the mail room. Sue: What now? Bob: They’re out of stamps or something silly like that.
McGrawhill's American Idioms And Phrasal Verbs