Obstruction, hindrance, or interference — actions that block or disturb someone or something, including signal jamming, sabotage, or interrupting activities.
試験で他人の答案を見せてもらうのは明らかな妨害だ。
Showing someone else's answers during an exam is clearly an obstruction (cheating).
道路工事が通行の妨害になっている。
The roadworks are obstructing traffic.
通信の妨害で電話がつながらなかった。
Because of signal interference, the phone couldn't connect.