How to Say "knock-off" in Spanish
The Spanish word for “knock-off” is “imitación” — B1 level. This is a very common word in everyday Spanish.
English → SpanishB1
nounB1
a copy of a branded product

Examples
Este reloj es una imitación barata.
This watch is a cheap knock-off.
Prefiero comprar imitación de cuero por ética.
I prefer to buy imitation leather for ethical reasons.
Cuidado, hay muchas imitaciones en este mercado.
Be careful, there are many fakes in this market.
Describing materials
To describe what something is made of, use 'de imitación' after the object, like 'cuero de imitación'.
Confusion with 'falso'
Mistake: “Es un imitación.”
Correction: Es una imitación (feminine noun) or 'Es falso' (adjective).
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