Back someone up
back someone up
verb phrase
to confirm what someone says; support what someone does: if you want to go in to complain, i’ll back you up (1860s+ british)
to be someone’s subst-tute; be in reserve: we’ve got three other drivers to back him up (1950s+)
to play behind a fielder to retrieve b-lls that might be missed (1940s+ baseball)
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