That's what I thought; mainly because 'repair' was grouped with 'move to chest', 'delete' and 'no action'. I figured, by selecting 'repair', Avast would attempt to "repair" (i.e. restore the file to its original state or replace the file with an uninfected copy) the file that is supposedly infected. Dr Web CureIt has a similar feature.
I'm currently changing Avast's settings around, so that's why I'm asking; I'm wondering if I should use 'repair' as my first automatic action.