To shorten s.t. (by cutting it); to trim s.t.
Any long object can be ‘trimmed’ as posts, boards, tails of fish or chicken, hedges, etc. If no object is mentioned it means fingernails.
Trim them; your fingernails are long.
(This form is used though the grammatically correct form would be ‘nettep du kew’ or ‘tettepanun kukkunun’.)
I have trimmed them; my fingernails are already short.
I trim those plants to plant them (the tops).
She cut her hair. Or: She cuts hair.