keep (someone/something) off something
phrasal verb with keep verb uk/kiːp/ us/kiːp/ kept | kept
B1 (使…)远离;(使…)不接近
to not go onto an area, or to stop someone or something going onto an area
There was a notice saying "Keep off the grass". 那儿有一块告示,上面写着“勿踏草地”。