I’m hoping for documented proof, but will also be happy with educated intuition.
Does “Suck it up” come from what drill sergeants tell recruits to do with their bellies (suck it in),
or is it a reference to actually sucking something into the mouth? I’m referring to the phrase as used to
mean endure difficult circumstances, put up with it, ignore adversity, etc. Or, is the origin a matter
of speculation? I haven’t found much in the usual sites.