put/get someone's back up
US /pʊt/ɡɛt ˈsʌm.wʌnz bæk ʌp/
UK /pʊt/ɡɛt ˈsʌm.wʌnz bæk ʌp/

1.
molestar, irritar
to annoy someone
:
•
His arrogant attitude really puts my back up.
Su actitud arrogante realmente me molesta.
•
Don't say things that will get her back up.
No digas cosas que la molesten.