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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 substitute; be in reserve: We’ve got three other drivers to back him up (1950s+)
To play behind a fielder to retrieve balls that might be missed (1940s+ Baseball)


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  • Backspin

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  • Backsplice

    a knot for finishing a rope end neatly, beginning with a crown and proceeding in a series of tucks, each strand over the first adjoining strand and under the next, the strands being split in half at each tuck. to make a backsplice in (a rope end).

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