[つのをためてうしをころす, tsunowotameteushiwokorosu] (exp, v5s) to throw the baby out with the bath water; to strain at a camel and swallow a gnat; to obsess over insignificant details and miss the larger point
[かっけいぎゅうとう, kakkeigyuutou] (n) using a meat ax when a knife would suffice; taking a sledgehammer to crack a nut; using a grand-scale measure (a massive instrument) to deal with an insignificant problem