to fetch someone from somewhere
Sinong susundo sa akin?
Who's going to pick me up?
Susunduin kita paglabas mo sa eskwelehan.
I'll pick you up when you get off from school.
a person with the responsibility of picking someone up
Sinong sundo mo?
Who's the person who's picking you up?
Depending on the context, this could also refer to the person being picked up.
See also kasundo.