In their/our/its/your midst Definition 1 of 3Pro Tip 1/3Group Infiltrators Implies someone hidden or unexpected is present within a specific group. We must be vigilant, as there could be spies in our midst. Pro Tip 2/3Secret Revealed Often reveals a surprise or a previously unknown fact about someone in a group. To everyone's shock, a hero was in their midst all along. Pro Tip 3/3Unnoticed Presence Highlights the group's unawareness of someone or something amongst them. The undercover agent remained in their midst undetected.