border on something—
1. be next to smth.; lie close to smth.:
- The old park borders on the shores of the lake.
2. (of a country) share a boundary with another country:
- Soviet territory facing the West borders on Poland, Czechoslovakia, and Hungary.
3. resemble smth.; verge upon smth.:
- What you are doing borders on the ridiculous.
border something—form a border along the edge of smth.:
- The climate of the land bordering the sea varies from being tropical in the south and sub-tropical in the north.