The word rapprochement is French, and means reconciliation. If two people have a conflict but they resolve the conflict in a friendly manner, then they accomplish a rapprochement.
The US-China rapprochment occurred in 1972 after President Richard Nixon visited Beijing in February 1972. But the US normalized its relations with China in January 1, 1979.
Adenaure's rapprochment with the West was marked by a famous meeting with De Gaulle in Paris 1963 - could not make up for damage to reputation in the decling years of his cheancellorship.