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make a difference

part of speech: phrase
definition 1: to have an impact or effect; to be of importance in some way.
A caring teacher can truly make a difference in a child's life.It makes a difference if you pronounce it this way or the other way, because it changes the meaning.The new curtains make a big difference in this room.
definition 2: to make a significant and beneficial impact on the lives of other people or living things.
He became a social worker in the hope of making a difference.