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We found 13 dictionaries with English definitions that include the word head first:
Click on the first link on a line below to go directly to a page where "head first" is defined.

General (8 matching dictionaries)

1. head first: Oxford Learner's Dictionaries [home, info]
2. head first: Macmillan Dictionary [home, info]
3. head-first: Wordnik [home, info]
4. head-first, head first: Wiktionary [home, info]
5. Head First (Badfinger album), Head First (Goldfrapp album), Head First (The Babys album), Head First (Uriah Heep album), Head First (book series), Head First (film), Head First, Head-first: Wikipedia, the Free Encyclopedia [home, info]
6. head-first: Dictionary/thesaurus [home, info]

Business (1 matching dictionary)

7. Head-first: Legal dictionary [home, info]

Computing (1 matching dictionary)

8. Head-first: Encyclopedia [home, info]

Medicine (1 matching dictionary)

9. Head-first: Medical dictionary [home, info]

Miscellaneous (1 matching dictionary)

10. Head-first: Idioms [home, info]

Slang (1 matching dictionary)

11. head first: Urban Dictionary [home, info]

Quick definitions from Wiktionary (head first) ▸ adverb:  With the head first or foremost. ▸ Words similar to head first ▸ Usage examples for head first ▸ Idioms related to head first (New!) ▸ Words that often appear near head first ▸ Rhymes of head first ▸ Invented words related to head first