To make something more lively, exciting, or interesting; to add energy or enthusiasm to something.
Derived from 'live' (to be alive, or to live fully) plus the suffix '-en' (to make or become). The word emerged in English to mean 'make more animated or spirited'.
The phrase 'liven up' shows how English adds particles to verbs to change their meaning—'live' becomes 'liven' (to make alive), then 'up' makes it even more energetic, creating layers of meaning from simple roots.
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