He sank into the fluffy pillows.
Meaning: He moved slowly downward inside the soft cushions used to support the head and neck while sleeping.
Choice of Words: Sank means to move or fall slowly downward. Into is a preposition that indicates movement or position inside something. The is an article that is used before a noun to indicate that the noun is specific or known. Fluffy means soft and light. Pillows means cushions used to support the head and neck while sleeping.
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