usisati

1. to vacuum
   Usisala sam ceo stan pre nego što su došli gosti. — I vacuumed the whole flat before the guests arrived.
   Možeš li da usisaš tepih u dnevnoj sobi? — Can you vacuum the carpet in the living room?
2. to suck in; to absorb
   Sunđer je usisao svu vodu sa stola. — The sponge absorbed all the water from the table.
   Pumpa je usisala vazduh i prestala da radi. — The pump sucked in air and stopped working.

The imperfective is usisavati; a vacuum cleaner is usisivač.