sentarse.
If anyone would like to improve my answer, please do, as I am not fluent in Spanish, but I know a few words.
Sientate
sentarse
It is said "Puedo sentarme a tu lado?"
"To feel" is the verb "sentir". Do not confuse this with "sentar", which means "to sit".
Sentar is the Spanish verb for "to sit". If you are asking someone to sit down, you would say "Sientese, por favor."
to sit = sentar or tomar asiento
Me gusta sentar en la sección no fumar.
The Spanish word "sientate" translates to "sit down" in English.
You sit down = Usted se sienta/te sientas (formal, informal) You sit (i.e. 'are seated') = Usted esta/tu estas sentado
Sit down!
앉아 = sit
In Chinese, to say "sit," you can say "坐下" (zuò xià).