up on sth

/ˌʌp ˌɒn ˌɛstˌiːˈeɪtʃ/

/ˌʌp ˌɑːn ˌɛstˌiːˈeɪtʃ/

up on sth

with an extensive knowledge concerning current topics and events

Examples

1. Avery pushed Mike's hand away and collected her thoughts before walking up on stage.

2. He raised himself up on one elbow to watch.

3. But didn't prehistoric humans hunt by sneaking up on animals and spearing or clubbing them?

4. When you come out of the station, Edinburgh Castle is in front of you, high up on a hill.