。
The fielder fumbled the ball.
Literal
Fielder [topic-は] ball [obj-を] catch-fail-[past-た].
取り損ねる is a compound verb: 取る ('take, catch') + 損ねる ('fail at, miss the chance to'). The auxiliary 損ねる attaches to verb stems to express failed/bungled attempts — 言い損ねる ('fail to say'), 食べ損ねる ('miss out on eating'). A productive way to express missed opportunities.