measure word · a classifier used for walls

那是一堵新砌的红砖墙。

verb · to block up or stop up a road, pipe, hole, or passage

请用塞子把那个瓶口堵上。

verb · feeling choked up or suffocated with anxiety, stress, or resentment

听了这些话，我心里堵得难受。

verb · a wall (literary usage)

观者如堵。