
riechen
to smell
To perceive a particular smell with the nose or to give off a smell. Often used with the preposition 'nach' (of/like).
Im ganzen Haus riecht es nach frisch gebackenem Kuchen.
The whole house smells of freshly baked cake.
to smell
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to smell
To perceive a particular smell with the nose or to give off a smell. Often used with the preposition 'nach' (of/like).
Im ganzen Haus riecht es nach frisch gebackenem Kuchen.
The whole house smells of freshly baked cake.

to smell
To actively use your nose to check the smell of something.
Er roch an der Milch, um festzustellen, ob sie noch gut ist.
He smelled the milk to find out whether it was still good.

can't stand someone/something
To absolutely dislike a person or thing; to have a strong aversion.
Ich kann seinen arroganten Kollegen einfach nicht riechen.
I simply can't stand his arrogant colleague.

to sense
In a figurative sense, to suspect, sense, or have a hunch about something without having concrete proof.
Sie roch sofort, dass etwas nicht in Ordnung war.
She immediately sensed that something was wrong.
'Riechen' (to smell) can be used in two ways. Either a person actively perceives a smell (transitive with an accusative object), or a thing gives off a smell (intransitive, often with 'es').
Ich rieche den Duft der Rosen.
I smell the scent of the roses.
When something has a particular smell, this is almost always expressed with the preposition 'nach' and the dative. The structure is: Es riecht nach + [smell].
Deine Hände riechen nach Zwiebeln.
Your hands smell of onions.
When you actively sniff something in order to check its smell, you use the preposition 'an' with the dative. The structure is: an etwas (Dativ) riechen.
Riech mal an dieser Blume, sie duftet herrlich!
Smell this flower, it smells wonderful!
The colloquial expression 'jemanden nicht riechen können' means that you don't like a person at all. The person you don't like is in the accusative.
Seit unserem Streit kann ich ihn einfach nicht mehr riechen.
Since our argument, I simply can't stand him anymore.
In a figurative sense, 'riechen' (to smell) means to suspect or sense something. Typical combinations are 'Gefahr riechen' (to smell danger) or 'den Braten riechen' (to smell a rat / suspect a trap).
Als der Chef so freundlich war, habe ich sofort den Braten gerochen.
When the boss was being so friendly, I immediately smelled a rat.
to stink
Riechen and stinken can both express that a smell is perceived or given off. Riechen is neutral in value and can describe something pleasant, unpleasant, or simply unspecified. Stinken, by contrast, refers to a very strong and unpleasant smell.

Im Zimmer riecht es nach frischem Kaffee.
The room smells of fresh coffee.
Im Zimmer stinkt der volle Mülleimer.
The full trash can stinks in the room.