Learn Turkish: Senin dekontu bulman için veznedar bekleyedursun. - Let the teller keep waiting for you to find the bank receipt.

This uses the Continuous Action Compound Verb (Sürerlik Fiili). We take the root bekle (wait), add the buffer -y-, the connecting vowel -e, and the auxiliary verb -dur to mean 'keep waiting'. The final -sun is the third-person imperative suffix, which translates to 'let him/her' (referring to the teller).

Is the -dur- part of the compound verb related to the verb durmak (to stop)?

Yes, it comes from the verb durmak. While durmak on its own often means 'to stop' or 'to stand', when used as the auxiliary in this compound structure (-(y)Adurmak), it means to 'stay in the state of doing' an action. It emphasizes that the teller's waiting continues uninterrupted in the background while you look for the receipt.

Why do we say senin bulman için instead of just bulmak için?

If you just say bulmak için (to find), it implies the subject of the main verb (the teller) is the one doing the finding. To express 'in order for YOU to find', we must use a possessive verbal noun construction. Senin means 'your' and bulman is the verbal noun bulma (finding) plus the second-person possessive -n.

Why does dekontu have the accusative case even though it is inside a subordinate clause?