what figurative language is this sentence:

The low and constant rumble under her feet lulled her into a daydream

Thanks

Low could suggest that the she is feeling discontented and fatigued going into a “constant” daydream. The Low and constant rumble could be the feelings of disruption in her head constantly, and low is the mood she’s feeling as-well as in her daydream.

We did to see the text because we can't choose an option without the text