Sick here means sick, and can be used as either a determiner or an epithet, mostly in American English, while ill, an adjective that also means sick, can only be used as an epithet, mostly in British English.
ck in a single word in the blast /k/ sound, pronunciation, the vocal cords do not vibrate, the back of the tongue raised, and the soft palate to form an obstruction, the airflow breaks through the back of the tongue and the soft palate of the obstruction, by the oral cavity burst out, send air strong. ck this combination of letters is only used in the stressed syllables in the single short vowel after the vowel, such as:
clock clock
duck duck mother duck <
chopsticks chopsticks
black black
chick chick
neck neck
socks short socks
truck truck
Hopefully, I can help you with your confusion.