Sentence:  At the very moment he cried out, David realised that what he had run into was only the Christmas tree. . . . There were no sounds of any movement upstairs: no shouts, no sleepy grumbles, only a gentle <WSD>tinkle</WSD> from the decorations as the tree had recovered from the collision. 
Meaning of the word marked with <WSD> tags:  A light metallic sound, resembling the tinkling of bells or wind chimes.