独り遊び

ひとりあそび【独り遊び】

playing by oneself; enjoying oneself on one's own; entertaining oneself; 〔トランプの〕 《米》 solitaire; 《英》 patience.

●この子は兄弟がいないからひとり遊びが上手だ. He doesn't have any brothers or sisters, so he's good at playing by himself [entertaining himself].

●ひとり遊びをする play by oneself; enjoy oneself on one's own; entertain oneself.