Palaiyan Murugadass, who allegedly used a 7-cm-long knife to slash Allen Remedios Adolfo's face, left wrist area and throat, causing a deep gaping would which would likely cause permanent scars.
If convicted, Palaiyan faces a jail term of up to 15 years and a fine or caning for hurting the 38-year-old Adolfo on Sunday.
Palaiyan is believed to be the ex-boyfriend of the Filipino victim who was working here as a maid, The Straits Times reported.
Adolfo had lost a lot of blood after the attack and was hospitalised.