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Definitiona smooth wave-like motion (physical or auditory)
having a wavy or rippled form or surface
- ...was his most perfect idea of heaven's happiness: mine was rocking in a rustling green tree, with a west wind blowing, and bright white clouds flitting rapidly above; and not only larks, but throstles, and blackbirds, and linnets, and cuckoos pouring out music on every side, and the moors seen at a distance, broken into cool dusky dells; but close by great swells of long grass undulating in waves to the breeze; and woods and sounding water, and the whole world awake and wild with joy.Chapter 24 (30% in)
There are no more uses of "undulate" in Wuthering Heights.
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