bottle out
US /ˈbɑː.t̬əl aʊt/
UK /ˈbɑː.t̬əl aʊt/

1.
echarse para atrás, acobardarse
to lose one's nerve and decide not to do something
:
•
He was going to ask her out, but he bottled out at the last minute.
Iba a invitarla a salir, pero se echó para atrás en el último minuto.
•
Don't bottle out now, you've come too far!
¡No te eches para atrás ahora, ya has llegado muy lejos!