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Phrase(s): Where (have) you been keeping yourself? [and] Where (have) you been hiding (yourself)?
Inf. I haven’t seen you for a long time. Where have you been? • Bill: Hi, Alice! Where you been keeping yourself ? Alice: Oh, I’ve been around. How are you doing? Bill: Okay. • John: What’s up? Bill: Hi. man. Where you been keeping yourself ? John: Oh, I’ve been busy.
McGrawhill's American Idioms And Phrasal Verbs