The term 'Build Up Interest' can be summarized as a process of increasing the attention and enthusiasm of people towards a certain topic or activity. This can be done by creating engaging content, providing incentives, and using effective marketing strategies. The crossword solution for this term is SAVE, which stands for Stimulate Attention, Value, and Engage. Stimulating attention involves creating content that is interesting and relevant to the target audience. Valuing the audience means providing incentives that will make them more likely to engage with the topic or activity. Finally, engaging the audience involves using effective marketing strategies such as social media campaigns and email campaigns.