noisy, disputatious
讙 centers on loud, contentious noise: being noisy or disputatious, often in a verbal or argumentative way.
讙 combines 言 (speech) with 雚, which likely contributes the sound and may relate to a heron or a clamorous bird, suggesting noisy speech.
Words 言 on the left and a noisy heron-like shape 雚 on the right: imagine a flock of herons squawking loudly, creating a disputatious racket.
For カン, picture a can being kicked noisily down a street during a heated argument: can -> カン, and the clatter matches the noisy, disputatious meaning.