A strong veteran, having trained for tens of years, can fall to a weakling in a moment of laxness. That's what the martial arts world is.
罠かもしれん、油断するな。
It could be a trap; don't let your guard down.
鍋にごま油を中火で熱し、にんにく、鶏肉を入れて炒め、色が変わったら中華スープと白菜を入れて煮る。
Heat sesame oil in the pan on a medium flame, add the chicken meat, the garlic and fry, when the colour changes pour in the Chinese soup, add the Chinese cabbage and boil.
まさか花子さんをストーキングするなんて・・・!最近、おとなしいから油断したわ!
That you should be stalking Hanako! You'd been quiet recently so I'd let my guard down.
それは出来ない相談だな。油物してる時に、火の傍から離れるのは言語道断だ。
I'm afraid I can't do that. Leaving the cooker while frying is completely out of the question.
For things that have had contents with volatile oil like thinners they should be left for a few days to completely evaporate it before being disposed of as non-flammable waste.
お茶は仕事をスムーズに運ばせるための潤滑油のようなもの。
Tea is like the lubricating oil of work to allow it to proceed smoothly.
列車は石油で走らせるのですか。
Do the trains run on diesel oil?
油断大敵。
Security is the greatest enemy.
油断なく注意さえしておれば好機はおのずからうまれる。
Plenty of opportunities will present themselves, if only you are awake to them.