Chip in Definition 1 of 3Pro Tip 1/3Informal Situations Used in casual conversations, not for formal occasions or official documents. Let's all chip in for pizza tonight! Pro Tip 2/3Group Efforts Implies collaboration or joint effort among people for a shared goal. We all need to chip in to finish this project by Monday. Pro Tip 3/3Volunteer Contributions Often suggests voluntary contribution, without precise amounts or obligations. Whenever there is a neighborhood clean-up, many residents chip in.