an ancient musical instrument
筑 refers to an ancient Chinese stringed musical instrument, similar to a zither, played by striking the strings with a bamboo stick.
筑 combines 竹 (bamboo) and 巩, which likely represents the action of holding or striking. Together they depict a bamboo-bodied instrument that is struck to produce sound.
The top 竹 is bamboo, and the bottom 巩 looks like a hand holding a stick. Imagine an ancient musician holding a bamboo stick to strike the strings of a bamboo zither: 筑.
For チク, picture the sound of the instrument: a quick 'chiku' as the bamboo stick hits the strings. The sharp 'chiku' sound cues チク.
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