Tidde is not a commonly used word and it is unclear what it refers to. The spelling of this word, however, can be explained using IPA phonetic transcription as /ˈtaɪdə/. This means that the first syllable of the word is pronounced like the word "tie" and the second syllable is pronounced like the word "duh". The "ə" indicates a schwa sound, which is an unstressed vowel sound. Ultimately, it is important to note that the spelling of a word does not always provide a clear indication of its pronunciation or meaning.