border

I UK [ˈbɔː(r)də(r)] / US [ˈbɔrdər] noun [countable]
Word forms "border":
singular border plural borders
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1) the official line separating two countries or regions

border between:

the border between Hungary and Romania

border with:

Iraq's northern border with Turkey

across/over the border:

Thousands of refugees were fleeing across the border.

cross the border:

You can't cross the border without a passport.

close/seal a border:

Troops have sealed the border in an effort to catch the guerrillas.

a) the area close to a border

on the border:

a town on the Canadian border

b) [only before noun] close to or relating to a border

border guards

the border town of Venlo

border disputes between neighbouring countries

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Cultural note:
In the UK, "the border" often refers to the border between England and Scotland: an issue that is dominating politics north of the border (=in Scotland). In the US, it usually refers to the border between the US and Mexico.

2) a band or pattern around the edge of something, especially for decoration

cotton sheets with a lace border

3) a narrow area at the edge of a lawn or garden path, with flowers and other small plants in it

4) the land around the edge of something

Rushes grew on the borders of the lake.

II UK [ˈbɔː(r)də(r)] / US [ˈbɔrdər] verb [transitive]
Word forms "border":
present tense I/you/we/they border he/she/it borders present participle bordering past tense bordered past participle bordered
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1) to form a line along the edge of something

The canal is bordered by poplar trees.

the wide avenue that borders the park

2) border or border on to be next to another country or region

Jordan holds a key position, bordering both Israel and Iraq.

Phrasal verbs:

- border on