used to transliterate Sanskrit 'va'
嚩 is a rare kanji used primarily to transliterate the Sanskrit syllable 'va' in Buddhist texts. Its standalone meaning is tied to this phonetic function rather than a concrete concept.
嚩 is a phono-semantic compound created for transliteration. It combines 口 (mouth, indicating a phonetic loan) with 縛, which likely provides the sound 'haku' or 'baku'.
The mouth radical 口 on the left hints that this kanji is used for its sound, like a mouth pronouncing a foreign syllable. The right side 縛 (bind) is just there for the sound, so think of a bound tongue trying to say 'va'.
For ハク, imagine a Buddhist monk chanting 'va' while wearing a hakama (袴): the first syllable 'ha' of hakama cues ハク, and the mouth 口 shapes the sacred syllable.