Call up and Look back

Call up verb - Get or try to get into communication (with someone) by telephone.

Look back and call up are semantically related in remember topic. In some cases you can use "Look back" instead a verb "Call up", when it comes to topics like keep in mind.

Look back verb - Look towards one's back.

Call up and look back are semantically related in remember topic. Sometimes you can use "Call up" instead a verb "Look back", if it concerns topics such as keep in mind.