have someone's back /hæv sˈʌmwʌnz bˈæk/ /hav sˈʌmwɒnz bˈak/
to look out for /lʊk aʊt fɔr/ /lʊk aʊt fɔː/
to watch over /wˈɑːtʃ ˈoʊvɚ/ /wˈɒtʃ ˈəʊvə/