1. make something more interesting or exciting/ make someone more energetic or alert
liven something up
To 'liven up' means to make more interesting or exciting. You could 'liven up a room' by playing music or adding more interesting furniture or colours. Someone with a bubbly personality might 'liven up' a party. Someone might 'liven up' when they are talking about a favourite hobby or person that they love. This is a common expression used in social and professional contexts.