From bihur (“loop; distortion”) +‎ -tu.

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• IPA^(key): (Southern) /biurtu/, [bi.ur.t̪u]
• IPA^(key): (Northern) /bihurtu/, [bi.ɦur.t̪u]

bihurtu ? (imperfect participle bihurtzen, future participle bihurtuko, short form bihur, verbal noun bihurtze)

1. to become, turn into
2. to return, go back
3. to return, give back
4. to twist, sprain

   Synonym: bihurritu

5. to turn, change (direction)
6. to translate
7. to turn to, convert to

• “bihurtu”, in Euskaltzaindiaren Hiztegia [Dictionary of the Basque Academy] (in Basque), Euskaltzaindia [Royal Academy of the Basque Language]
• “bihurtu”, in Orotariko Euskal Hiztegia [General Basque Dictionary], Euskaltzaindia, 1987–2005