chun-chun（チュンチュン）
chun-chun describes the short, high-pitched chirping sound made by small birds, typically sparrows.
chiku-taku（チクタク）
chiku-taku describes the regular ticking sound produced by a clock or similar mechanical device.
chu（チュ）
chu describes the light sound or gesture of a small kiss.
chira-chira（チラチラ）
chira-chira describes repeated, intermittent, or flickering movements of looking or appearing.
chira（チラ）
chira describes a brief, subtle, or sideways glance.