backstabbing
01
裏切りの, 陰険な
being dishonest and betraying someone behind their back, without them knowing
例
She was shocked to discover the backstabbing within her group of friends, as they spread rumors about her behind her back.
彼女は、友達グループ内での裏切りを発見してショックを受けた。彼らは彼女の背後で彼女についての噂を広めていた。
