noun
toy bamboo-leaf boat
A small boat folded from a bamboo leaf, often made by children to float on water.
子供たちが小川で笹舟を流して遊んでいる。
The children are playing by floating bamboo-leaf boats in the stream.
Compound of 笹 (sasa, 'bamboo grass') and 舟 (fune, 'boat'), with rendaku voicing fune → bune.