In English, to remember is to retrieve something from the back of the mind. In Torah, when HaShem remembers, something happens. Zakar is remembrance that acts.

Watch the verb at work. When HaShem remembers Noach, the waters recede (Bereshit, Genesis 8:1). When He remembers Avraham, Lot is pulled out of the fire (Bereshit, Genesis 19:29). When He remembers His covenant, the Exodus begins (Shemot, Exodus 2:24). In every case the remembering is not a mental note; it is HaShem re-engaging a commitment and moving on it. To zakar is to re-enter a relationship and to do something about it.

This is the verb living under the noun zikaron, the memorial that triggers the remembering. So when Yeshua says "do this in remembrance of Me," He is not asking for a sentimental pause. He is using covenant-command language: perform this act so that what was accomplished becomes present and active again. The remembering itself does something. That is the weight the church emptied when it rendered the cup as merely "in memory of."