back up
🇺🇸
/bæk ʌp/
🇬🇧
/bæk ʌp/
phrase verb
B2
to help or support someone
My family will always back me up when I need help.
C2
to confirm that what someone says is true
Claire will back me up, so you can believe what I say.
translation
to help or support someone; to confirm that what someone says is true