to menace, to howl at, to bawl
嘑 centers on loud, aggressive vocal expression: menacing someone, howling, or bawling. The common thread is a forceful, often threatening, shout or cry.
嘑 combines 口 (mouth) with 虖, which likely contributes the sound and may relate to calling out or shouting. The exact historical development of 虖 is uncertain.
The mouth 口 beside 虖 suggests a wide-open mouth roaring or howling. Picture a person with a tiger-like mouth (虍) bellowing a threat.
For コ, imagine a menacing voice calling out 'Co!' like a sharp, barking command. The sound 'Co' cues コ while the mouth 口 delivers the threat.