estrechaste
-you narrowed
The word estrechaste is the preterite form of estrechar in the second person singular. There are other translations for this conjugation.
See the full estrechar conjugation

estrechar

Viniste a mi oficina y estrechaste mi mano.
You came to my office and you shook my hand.
¿Por qué no le estrechaste la mano?
Why didn't you shake his hand?
Le estrechaste la mano.
So you shook his hand.
¡Bueno, cuando estrechaste la mano, me estrechaste la mano!
When you shake hands, you shake hands!
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