expression, godan verb (-ku)
look into someone's face; examine someone's expression
Used when peering at someone's face to read their emotions or reaction, often with a sense of curiosity or concern.
彼は黙って私の顔を覗き込んだ。
He silently peered into my face.
子供が母親の顔を覗いて、
The child looked into his mother's face to gauge her mood.