Usage Note
Tuerca specifically refers to the threaded nut that pairs with a tornillo (bolt/screw). The phrase apretarle las tuercas a alguien ('to tighten the nuts on someone') means to put pressure on someone or make them comply.
Examples
"Aprieta bien la tuerca para que no se suelte."
Natural Translation
Tighten the nut well so it does not come loose.

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