We found one dictionary that defines the word trailing off:

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1. trailing off: Collins English Dictionary

Phrases: voice trailing off, more... ▸ Words similar to trailing off ▸ Usage examples for trailing off ▸ Idioms related to trailing off ▸ Wikipedia articles (New!) ▸ Words that often appear near trailing off ▸ Rhymes of trailing off ▸ Invented words related to trailing off