Can the word "overseas" be used to country bordered by land. For example is it correct if someone says I am doing work overseas if he is is doing work in the neighbouring country border by land not water with his country?
From a British English perspective it is a synonym of abroad, but from a continental Europe perspective, for instance, it would not be used to refer to countries that are not divided by the sea or the ocean.
to or in a foreign country, especially those separated from your country by the sea or ocean (synonym abroad)
- to live/work/go overseas The product is sold both at home and overseas. He was working overseas for an oil company.
- 1580s, from over + sea. Popularised during World War I as a British euphemism for "colonial."