しくじる
しくじる · shikujiru · JLPT N1 · verb-godan
to fail
仕 (do) + 損じる (miss, botch) = do it and miss: to fail or blunder
Thought to come from 仕損じる (shi-sonjiru), meaning do and botch. Over time the sound softened into しくじる. Use it for a slip or a plan that falls through.