Computing (FOLDOC) dictionary
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To process each element of a list of things. "Hold on, I've
got to loop through my paper mail." Derives from the
computer-language notion of an iterative loop; compare "cdr
down" (under
cdr), which is less common among C and Unix
programmers. ITS hackers used to say "IRP over" after an
obscure pseudo-op in the MIDAS PDP-10 assembler.