to be obstructed, to be blocked, (kokuji)
閊 centers on obstruction or blockage, specifically the state of being stopped or hindered. It is a kokuji created in Japan to express this idea.
閊 is a Japanese kokuji, combining the gate radical 門 with 山 (mountain) inside. The exact historical reasoning is uncertain, but it likely uses the image of a mountain blocking a gate to express obstruction.
A mountain 山 is stuck inside a gate 門, blocking the way completely. Picture a huge rock wedged in the doorway so nothing can pass.
For つか, imagine trying to push through the blocked gate but getting stuck with a sudden 'tsuka!' sound as you hit the obstacle. The sharp stop cues つか.
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