http://lao.voanews5aitmne6gs2btokcacixclgfl43cv27sirgbauyyjylwpdtqd.onion/a/english-in-a-minute-firing-on-all-cylinders/7108559.html
ຂອບໃຈ, ໂຈນາທານ! Some engines are powered by explosions in small cylinders. When all cylinders are firing, an engine is fully powered. The idiom “firing on all cylinders” means something is performing well. But if you say you’re not firing on all cylinders, it means you’re not at your best.