1. A hairstyle or hairdo that is incomplete, unfinished, or not fully styled
She left the salon with a half-do because the stylist didn't finish her hair.
Ela saiu do salão com um penteado incompleto porque a cabeleireira não terminou seu cabelo.
2. Colloquially, any task or job that is done incompletely or inadequately
The painter's work was just a half-do; he didn't finish the walls properly.
O trabalho do pintor foi apenas um trabalho incompleto; ele não terminou as paredes direito.