How to say to speak in Arabic language, study the correct pronunciation and look for the words analysis.
تَكَلَّمَ للتحدث كَلَّمَ means to speak in Arabic language
Translating each word from Arabic to English the meaning is:
تَكَلَّمَ للتحدث كَلَّمَ
to have a conversation to have a conversation (transitive) to speak