试探 (shì tan): เพื่อให้เสียงออกมา

Don't directly ask the boss about a raise; first sound out his attitude.

She used a casual tone to sound out whether her boyfriend remembered their anniversary.

The police used a few questions to sound out the suspect and see if he would let something slip.

I want to get a cat, but first I need to sound out whether my roommate is allergic to cat fur.