There is no need for you to cry out to heaven and earth like this for no reason.
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Read as 吖 the character means 'to shout / cry out', an archaic usage you'll only see in classical or dialect texts. Modern Chinese uses 喊 or 叫 instead.
The mouth radical 口 appears because the character was coined as a sound-transliteration glyph; the mouth marks it as a phonetic loan rather than a meaning-bearing word.
