louse
word
Definition
A small parasitic insect that lives on the skin or hair of humans and animals and feeds on their blood. The word "louse" can also informally mean a mean or unpleasant person.
Usage & Nuances
"Louse" is the singular form (plural "lice"). It is mainly used in scientific or medical contexts. The informal meaning ('an unpleasant person') is old-fashioned and rare today. The phrase "to louse up" means to mess up something.
Example Sentences
A louse can cause itching on your scalp.
basic
Teachers checked for louse in the children's hair.
basic
The scientist studied the louse under a microscope.
basic
Turns out I had a single louse in my hair—no wonder it was itching so much!
natural
Don’t be a louse—help your friend when they need it.
natural
I really loused up my chance at the interview by arriving late.
natural