蚊か柱ばしら

noun

mosquito swarm; swarm of mosquitoes

Refers to a dense, column-like swarm of mosquitoes, often seen in summer evenings.

• 夕ゆう方がた、公こう園えんで蚊か柱ばしらを見みた。

  I saw a mosquito swarm in the park in the evening.