This is the 936th most frequent Estonian word.
tunnevad
"Feel" or "know" (third person plural of "tundma").
Here, 'tunnevad' is used to mean 'know', indicating familiarity or recognition of someone.
Nad tunnevad teda hästi.
They know him well.
Here, 'tunnevad' expresses feeling or experiencing an emotion, in this case, 'joy'.
Lapsed tunnevad rõõmu mängimisest.
The children feel joy from playing.
In this sentence, 'tunnevad' conveys the physical sensation of feeling cold.