hoarse
嗄 centers on a rough, strained voice: being hoarse or speaking in a raspy, unclear way.
嗄 combines 口 (mouth) with 夏, which likely contributes the sound and may relate to a harsh or rough quality, suggesting a hoarse voice.
The mouth radical 口 beside 夏 (summer) suggests a throat dried out by summer heat, leaving the voice hoarse and raspy.
For サ, imagine a hoarse singer trying to hit a note but only managing a rough 'sa' sound: sa -> サ, and the voice cracks from strain.