Use 'defer to' when acknowledging someone's greater knowledge or experience on a subject. I'm not sure which wine to choose, so I'll defer to the sommelier.
Pro Tip 2/3
Not Absolute Agreement
'Defer to' doesn't always mean you agree completely, but that you respect the other's opinion more than your own. Although I have my doubts, I will defer to your expertise.
Pro Tip 3/3
Hierarchy Implications
Using 'defer to' can suggest a hierarchy, where the person being deferred to is in a position of authority. In matters of safety, we defer to the captain's instructions.