This is the 204th most frequent Latvian word.
cilvēkus
"People" or "humans" (accusative plural form).
In this sentence, the word 'cilvēkus' is the plural accusative form, used as the object of the verb 'redzēju' ('saw').
Es redzēju cilvēkus parkā pastaigājoties.
I saw people in the park walking.
Here, 'cilvēkus' transforms to the dative plural form 'cilvēkiem', as it indicates the recipient of the action ('helps').
Viņa vienmēr palīdz cilvēkiem, kad viņiem ir grūti.
She always helps people when they are having a hard time.
In this instance, 'cilvēkiem' (dative plural form of 'cilvēkus') is used to express the entity receiving the respectful treatment.