expression, godan verb (-ku)
leave out of the loop; leave in the dark; exclude from a group
Idiomatic expression, usually used in the passive form 蚊帳の外に置かれる. Conveys being deliberately excluded from information, decisions, or a social circle, like being left outside a mosquito net while others are inside.
大事な会議なのに、私は蚊帳の外に置かれた。
Even though it was an important meeting, I was left out of the loop.
彼だけ蚊帳の外に置くのはかわいそうだ。
It's pitiful to leave only him out in the cold.