toes
Your toes are the five movable parts at the end of each foot.
She wiggled her toes against the packed sand.
她用脚趾拨弄着板结的沙子。
keep someone on their toes
If you say that someone or something keeps you on your toes, you mean that they cause you to remain alert and ready for anything that might happen.
His fiery campaign rhetoric has kept opposition parties on their toes for months.
他激烈的竞选言辞使反对党数月保持警觉。