stiskati

1. to squeeze; to press
   Stalno stiska dugme, a lift ne dolazi. — He keeps pressing the button, but the lift isn't coming.
   Dok je čekala rezultate, stiskala je pesnice. — While she waited for the results, she was clenching her fists.
2. to hug; to hold tight
   Mama ga je stiskala i nije htela da ga pusti. — Mum was hugging him tight and didn't want to let him go.
3. (stiskati se) to squeeze together; to huddle
   U autobusu smo se stiskali kao sardine. — We were packed like sardines on the bus.
4. colloq. (of money) to be stingy; to skimp
   Ne stiskaj pare, častimo se večeras! — Don't be stingy, let's treat ourselves tonight!

The perfective is stisnuti; 'press the button' is often stisnuti dugme in speech.