the new kid on the block Informal
Meaning: If you are the new kid on the block, you are the newest person in a workplace or in an educational institute, or any other place or organization.
- Have you met Brigette? She's the new kid on the block - just started working here today.
- Paula hates being the new kid on the block. She finds meeting lots of new people stressful, and she gets nervous when she thinks that everyone is looking at her and trying to decide if they like her.