Au courant and On to

Au courant adjective - Keenly aware of and responsive to the latest developments especially in fashion and entertainment.

On to and au courant are semantically related In some cases you can use "On to" instead an adjective phrase "Au courant".

Au courant and on to are semantically related in aware topic. Sometimes you can use "Au courant" instead an adjective phrase "On to", if it concerns topics such as alert, cognizant, attentive, knowledgeable.