The phrase "cluing one in" is used to describe the act of informing someone or bringing them up to speed on a particular topic or situation. Antonyms for this phrase could be keeping someone in the dark, withholding information, or leaving someone out of the loop. These actions can lead to confusion, misunderstandings, and ultimately, mistrust between people. It is important to be transparent and open with communication to build strong relationships and avoid creating unnecessary tension. By providing clear and concise information, everyone involved can feel valued and included in the decision-making process.