unajmljivati

1. (of people) to hire
   Firma često unajmljuje studente preko leta. — The company often hires students over the summer.
   Za takve poslove unajmljuju spoljne saradnike. — They hire outside contractors for that kind of work.
2. (of things) to rent; to hire
   Svakog leta unajmljujemo kuću na moru. — Every summer we rent a house by the sea.

To let something out to others is usually iznajmljivati, not unajmljivati.