This is the verse translation, not a definition of the individual word.
They did not revere Allah His true reverence when they said, “Allah has sent down nothing to human beings.” Say [O Prophet], “Who then sent down the Scripture that Moses brought as a light and guidance for people, but you make it into separate sheets – revealing some and concealing much, although you have been taught [this Qur’an] which neither you nor your forefathers knew?” Say, “Allah [sent it down].” Then leave them to amuse themselves in their falsehood.