Learn Turkish: Sekreter misafirleri buluşturdu ve onlardan kartvizitlerini istedi. - The secretary brought the guests together and asked for their business cards.

The root is bul- (to find). Adding the reciprocal suffix -uş gives us buluş- (to find each other, meaning to meet). Then, adding the causative suffix -tur creates buluştur-, which means "to cause to meet" or "to bring together". Finally, -du is the past tense. This is a perfect example of reciprocal-causative voice stacking.

Why is misafirleri in the accusative case? Don't reciprocal verbs usually involve "with" (ile)?

If the verb were just the reciprocal buluştular (they met), you would use ile (with). However, adding the causative suffix -tur makes the verb transitive. The secretary is the one doing the action of bringing people together, making misafirleri (the guests) the direct object receiving that action, which requires the accusative case -i.

Why does the sentence use onlardan (from them) when the English translation says "asked them"?

In Turkish, the verb istemek (to want / to ask for) takes the ablative case (-dan / -den) for the person you are making the request to. Literally, the secretary wanted the business cards from them. This is a vital pattern to remember for verbs of requesting or borrowing.

Can you break down the stack of suffixes on kartvizitlerini?