It was just one word in one email, but it triggered huge financial losses for a multinational company.

The message, written in English, was sent by a native speaker to a colleague for whom English was a second language. Unsure of the word, the recipient found two contradictory meanings in his dictionary. He acted on the wrong one.

Months later, senior management investigated why the project had flopped, costing hundreds of thousands of dollars. “It all traced back to this one word,” says Chia Suan Chong, a UK-based communications skills and intercultural trainer, who didn't reveal the tricky word because it is highly industry-specific and possibly identifiable. “Things spiralled out of control because both parties were thinking the opposite.”