A cliché is a saying that has been overused and has lost it’s meaning. Colloquialisms are slang, informal, or localized language. When writing formal papers, both clichés and colloquialisms are inappropriate. Eliminating them requires changing habits.
Examples of inappropriate phrases:
“She was running around like a chicken with her head cut off. “ (cliché)
“He kicked the bucket” (cliché)
“I was walking on egg shells” (cliché)
“SeaAggies, Marbies, dudes, Y’all get that?”( colloquialisms)