"How is the day, grandmother?"
Translation:Habari za leo bibi?
Siku is used to refer to the number of days past while leo is used to refer to what time of the week an event will happen. Usiku is the opposite of siku because of the "u". I.e usiku means night and siku means day. The "u" in this case signifies the negation or opposite meaning of the word siku.