Sentence: Loudly and fast on the Ridge Road beat The regular fall of Fearnaught's feet, On his broad, bare back his rider's seat Was as firm as the tread of the steed so fleet Small need of saddle, or bridle rein, He answered as well her touch on his mane.
Combination: the tread of the steed (root: tread, modifier: steed)
Property: rhythmic
Property type: emergent