to sit or stand with your legs on either side of someone or something:
The photo shows him dressed in leather, straddling a motorbike.
if something straddles a line, road, or river, part of it is on one side and part on the other side
straddle something between something
Mount Elgon straddles the border between Kenya and Uganda.
to include different areas of activity, groups, time etc:
Her research straddles mathematics and social sciences.
immigrants straddling two cultures