We found one dictionary that defines the word all by himself:

General (1 matching dictionary)

1. all by himself: Longman Dictionary of Contemporary English

Phrases: all by herself or himself, more... ▸ Words similar to all by himself ▸ Usage examples for all by himself ▸ Idioms related to all by himself ▸ Wikipedia articles (New!) ▸ Words that often appear near all by himself ▸ Rhymes of all by himself ▸ Invented words related to all by himself