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highly strung /ˌhaɪli ˈstrʌŋ/ (of a person or an animal) nervous and easily upset. Sp. 'Muy inquieto' 'Intranquilo' 'Un manojo de nervios' 'Desasosegado'

E.g.

a sensitive and highly-strung child
Their new horse is very highly strung.

 

If/ when it comes to the crunch: when a situation becomes extremely serious and a decision must be made. Crunch (Sp. crujido).

E.g.

 If it comes to the crunch and you and your husband do split up, you can always stay with us.

They argue a lot, but when it comes to the crunch, they are very loyal to each other.  Sp. Pelean mucho, pero a la hora de la verdad son muy leales el uno con el otro.

back out (of something) ​to decide that you are no longer going to take part in something that has been agreed

E.g.

He lost confidence and backed out of the deal at the last minute.

At the last minute, the investors backed out. Sp. A último momento, los inversores se echaron atrás.

leave [sb] in the lurch to fail to help somebody when they are relying on you to do so. Abandon. Sp. dejar en la estacada, abandonar. lurch (Sp. sacudida)

E.g.

I’m sorry to leave you in the lurch but I can’t do the presentation with you this afternoon. 

She felt she had been left in the lurch by all her colleagues

speak up:

1. (talk more loudly)    hablar más fuerte.

E.g. Please speak up. I can't hear you!

2. (express an opinion)    decir lo que se piensa, dar la opinión de uno.

E.g.

I always hated to speak up in class, so I got poor grades for oral participation.

There was a brief silence, then Gerald spoke up.

 

put in your two penn'orth /ˈpenəθ/ (also put in your two pennyworth) (both British English) (North American English put in your two cents’ worth)      ​(informal) to give your opinion about something, even if other people do not want to hear it.

E.g.

I thought I'd just throw in (= add) my two cents' worth.