noun
a nod - a gesture of acknowledgement or agreement
preposition
to/towards - indicating direction or intention
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The architect's design for the new building includes a nod towards sustainable materials.
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The chef's recipe for the dish was a nod to her grandmother's cooking.
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The rapper's new song is a nod to the old school hip-hop style.
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The painting's use of color is a nod towards the artist's emotional state.