glance, peep, roar, growl
闞 centers on looking or sounding through an opening: glancing or peeping visually, and roaring or growling as a forceful sound that bursts out.
闞 combines 門 (gate) with 敢, which likely contributes the sound and the idea of boldness or daring. The gate suggests looking or sounding through an opening.
Through the gate 門, someone dares 敢 to glance or peep inside, and a sudden roar or growl bursts out.
For カン, imagine peeping through a gate and seeing a can that suddenly roars: can -> カン.