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louse

1 louse /ˈlaʊs/ noun
1 louse
/ˈlaʊs/
noun
Britannica Dictionary definition of LOUSE
[count]
plural lice /ˈlaɪs/ : a type of small insect that lives on the bodies of people or animals
informal plural louses : a bad or cruel person
2 louse /ˈlaʊs/ verb
louses; loused; lousing
2 louse
/ˈlaʊs/
verb
louses; loused; lousing
Britannica Dictionary definition of LOUSE

louse up

[phrasal verb]
louse (something) up or louse up (something) informal
: to do (something) badly : to cause (something) to be ruined or spoiled