This is the 16192nd most frequent Polish word.
umówili
"Umówili" means "they arranged" or "they agreed" in English.
Here, 'umówiliśmy' refers to the first person plural (we) past tense form, indicating an arrangement or mutual agreement to meet.
Wczoraj umówiliśmy się na spacer w parku.
Yesterday, we arranged to meet for a walk in the park.
In this sentence, 'umówili' refers to the third person plural (they) perfective past tense form, indicating completing the act of making an arrangement.
Czy oni już umówili się z lekarzem?
Have they already made an appointment with the doctor?
Here, 'umówili' is used in a negated past tense to refer to a failure to arrange or agree previously.