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Use "withholder" in a sentence
"This sounds so mundane, but it is very big for me since I am generally a withholder."
"As Janet describes the incident, she is the innocent seeker of information and the teacher is the malicious withholder."
"I didn't want to sound like a dunce or a withholder of crucial information, but I had to tell him, for my sake as well as his own, when I realized what her statements implied."