roar, howl, scream, whistle
嘨 centers on producing a loud, forceful sound from the mouth: roaring, howling, screaming, or whistling. All meanings share the idea of a strong vocal outburst.
嘨 combines 口 (mouth) with 粛, which likely contributes a sound element. The character is a variant form of 嘯, which uses 肅 instead of 粛. The exact historical development of the 粛 form is uncertain.
The mouth radical 口 on the left opens wide, while the right side 粛 suggests a forceful, rushing sound. Imagine a mouth releasing a powerful roar or whistle that echoes.
For ショウ, picture a show where a performer lets out a loud roar: show -> ショウ, and the mouth 口 produces the sound.