In the English speaking world, many call Holy Thursday "Maundy Thursday."
What does that mean?
The word Maundy is related to the Latin word, "mandatum," and is found in the liturgy during the washing of the feet.
Dom Prosper Gueranger explains this meaning in his Liturgical Year.
This antiphon is taken from the Gospel of John and repeats the words of Jesus to his Apostles.
"Maundy Thursday" is then translated as "Commandment Thursday," a reference to the "new commandment" Jesus proclaimed, focused on loving others as Jesus loves us.