stink

An unpleasant smell makes something stink.

The word "stink" is commonly used when we notice a strong bad odor. We might say that a dumpster stinks or that last night's fish dinner still stinks. You can also use it to describe someone's body odor after not showering for a while - just be polite about it. Some places, like sewers or toilets, naturally stink because of the way they work. If you're going to say something stinks, try to think about what might be causing that smell and whether there's anything you can do to fix it.