This is the 3426th most frequent Portuguese word.
lembre
"Remember" (imperative form).
In this sentence, 'lembre' is utilized as a form of the verb 'lembrar' (to remember) signaling a reflexive action, hence a reminder to oneself.
Lembre-se de levar o guarda-chuva.
Remember to take the umbrella.
Here, 'lembre' is used in the subjunctive mood to express a desired or necessary action related to remembering.
É importante que você lembre do compromisso amanhã.
It is important that you remember the appointment tomorrow.
Similar to the first sentence, 'lembre-se' is encouraging the act of recalling something to oneself, emphasizing the imperative aspect.