This is the 6244th most frequent Japanese word.
クルッ
"クルッ" (kuru') describes a quick spinning or turning motion.
In this sentence, 'クルッ' is used to describe the sudden swift turning motion of the cat.
猫が急にクルッと振り向いた。
The cat suddenly turned around swiftly.
Here, 'クルッ' represents the state of hair being curled round and neat.
彼女は髪の毛をクルッと巻いていた。
She had her hair curled neatly.
This usage of 'クルッ' conveys the spinning motion of the paper airplane in the air.