Present participle of boomerang; in the process of coming back to affect the person or group that caused it.
From 'boomerang' + '-ing' (present participle suffix). This formation is standard in English for creating continuous or ongoing forms of verbs.
The '-ing' form lets us talk about actions as happening right now or as ongoing processes—'boomeranging' sounds more dynamic than 'boomeranged' because we're describing action in progress rather than completion!
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