on foot
1． by walking步行
Sally's bicycle broke and she had to return home on foot．萨莉的自行车坏了，她只好步行回家。
2． being planned在计划中
Plans have been set on foot by the
company for a party，because Miss Jackson is retiring．公司已经计划举办一次聚会，以欢送杰克逊小姐退休。
A plan's on foot to invite the Minister of Health to visit our hospital．邀请卫生部长来我们医院访问的准备工作正在进行。