This is the 11498th most frequent Spanish word.
extendió
"Extendió" means "extended" in English.
In this sentence, 'extendió' is used as the past tense form of the verb 'extender', meaning to elongate or make longer in a figurative sense (extending an explanation).
El profesor extendió su explicación para aclarar todas las dudas.
The teacher extended his explanation to clarify all the doubts.
Here 'extendió' describes the action of the rope stretching or spanning a space naturally and physically.
La cuerda se extendió de un extremo al otro de la habitación.
The rope extended from one end to the other of the room.
In this case, 'extendió' refers to physically stretching out or elongating one's arms in an effort to reach something.