godan verb (-ru), transitive verb
slurp; sip loudly
Used for drinking liquids, especially hot soup or noodles, with a loud sucking noise. Common in Japanese dining culture.
ラーメンをすする音が聞こえる。
I can hear the sound of someone slurping ramen.
熱いお茶をすすりながら話
We talked while sipping hot tea.
godan verb (-ru), transitive verb
Almost always used in the phrase 鼻をすする, meaning to sniffle or sniff back mucus, often when crying or having a cold.
彼女は泣きながら鼻をすすった。
She sniffled as she cried.
風邪で鼻をすするのが止まらない。
I can't stop sniffling because of my cold.