Words / C1

und-uh-PIN/ˌʌndəˈpɪn/

To underpin is to hold an idea or system up from below: examples underpin an explanation; trust underpins the deal. Support is everyday and can be a side prop; underpin is the foundation. Bolster is a later boost. Underpinning is the noun. Common in academic and policy English; in speech, that’s what it rests on is clearer.

Meaning

To support or form the basis of an idea or a system.

Examples

• “Clear examples underpin a good explanation.”
• “Two assumptions underpin the whole model.”
• “Clear rights underpin a free press; slogans do not.”

Good to know

underpin an argument/system. Foundation, not a later boost (bolster). Everyday: rest on / support.

Near in meaning

support

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