Attend course (4)
I believe the answer is:
beat
This might be a double definition.
'attend' is the first definition.
The definition and answer can be both to do with perception as well as being verbs in their base form.
Maybe there's an association between them I don't understand?
'course' is the second definition.
(thesaurus)
Can you help me to learn more?
(Other definitions for beat that I've seen before include "Musical rhythm" , "Rhythmic music unit" , "assigned patrol" , "Master" , "Strike (a drum)" .)