high spirits
亢 centers on a state of high, intense emotion or energy: high spirits, excitement, or being worked up.
亢 is thought to depict a person with a raised neck or head, conveying the idea of high spirits or arrogance. The modern form 亠 over 几 is a stylized representation of that raised posture.
The top 亠 looks like a head held high, and the bottom 几 resembles a person standing tall. Together they show someone in high spirits, chest out and head up.
For コウ, imagine a person in high spirits shouting 'Kō!' like a triumphant exclamation: Kō -> コウ, matching the raised energy of 亢.
rising; exacerbated; exasperated; accelerated; aggravated
Chinese "Neck" constellation (one of the 28 mansions)
dragon that has ascended to the heavens; person who has acquired immense wealth and power
the arrogant dragon will have cause to repent; he who reaches the top is bound to fail if he is not prudent
hyperparathyroidism
primary hyperparathyroidism
palpitations; tachycardia
idiopathic intracranial hypertension; benign intracranial hypertension; pseudotumor cerebri
hyperthyroidism
hyperarousal (symptom of PTSD)