This is the 17903rd most frequent Russian word.
утку
The Russian word "утку" is the accusative or singular form of "утка," meaning "duck" in English.
In this sentence, 'утку' is in the accusative case as it is the direct object of the verb 'видел'.
Я видел утку, плывущую по озеру.
I saw a duck swimming in the lake.
Here, 'утку' metaphorically means 'false news or joke', reflecting idiomatic and colloquial usage.
Он рассказал смешную утку на вечеринке.
He told a funny anecdote at the party.
In this case, 'утку' refers to 'duck as food' and is again in the accusative case, showing its use in culinary context.