This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
譃 is a rare character combining 言 (speech) with 虚 (void, false). Its exact historical development is uncertain, but it likely expresses falsehood or deception through speech.
The left side 言 (speech) and right side 虚 (void, false) together suggest empty or false words. Picture a speech bubble filled with nothing but hollow air.
For ク, imagine a cool liar whose false words are as empty as the void: cool -> ク, and the speech is hollow.