Thieves will be caught.
it is an idiom
The idiom is "dead certainty". It means it's in the bag = this is a dead certainty = this is cinch
It refers to a ship that is not going anywhere and is dead in the water. If you are dead in the water, you are at a stop and unable to proceed.
It means that Tom got on the train at eight o'clock. "Caught" just means he was there on time and made it into his seat.
It is a fishing term. At first is seemed as if you were caught ( hooked ) but you escaped capture or consequence.
If something "catches" your eye, it has snagged your attention. You are focused on that thing for whatever reason.
This is not an idiom. Idioms make little or no sense unless you know the definition. This sentence makes perfect sense, so it is not an idiom. The dead fish smelled so bad that even as high as Heaven, you could smell them.
trains used to run on steam, when they ran out they wouldnt be able to move anymore. its the same for people, when your "running out of steam" your getting tired, and weak
To be 'as dead as a donut' is to be utterly dead, devoid of life (when applied to people, plants or animals) or finished with, unusable (when applied to inanimate objects).
Stopping dead in one's tracks means stopping all of a sudden on seeing something that is shocking or out of the place.
Things tend to be quiet at night, as if they were "dead." So if something is "dead as night," it means it is very quiet, not moving around, not making noise.