First you have to understand that the goatee has always been hard to pin down.
In fact it's hard to pin down exactly what it is, which is just the kind of venue I'm interested in.
She spent an hour and a half on her bracket strategy, trying to pin down what kind of girl Galavis would be interested in.
Journalists ask specific questions for a reason: to try to pin down the politicians.
At one point in the Introduction, the coach opines, “history is hard to pin down.”
Even that sweet green maiden-hair fern might pin down your foot so firmly that it would take a fish's sharp tooth to set you free.
But she could not pin down what she wanted to think about; because, no doubt, there was so very much.
Instead, he feinted with his club until he managed to pin down the venomous head.
By running the pin down into the sand all the way, you can make it look just like a goldpiece lying on the floor of the cave.
Frequently, too, the problems treated in psychotherapy are hard to pin down and are less specific.
late Old English pinn "peg, bolt," from Proto-Germanic *penn- "jutting point or peak" (cf. Old Saxon pin "peg," Old Norse pinni "peg, tack," Middle Dutch pin "pin, peg," Old High German pfinn, German Pinne "pin, tack") from Latin pinna "a feather, plume;" in plural "a wing;" also "fin, scoop of a water wheel;" also "a pinnacle; a promontory, cape; battlement" (e.g. in Luke iv:9 in Vulgate) and so applied to "points" of various sorts, from PIE *pet- (see pen (n.1)).
Latin pinna and penna "a feather, plume," in plural "a wing," are treated as identical in Watkins, etc., but regarded as separate (but confused) Latin words by Tucker and others, who derive pinna from PIE *spei- "sharp point" (cf. spike (n.1)) and see the "feather/wing" sense as secondary.
The modern slender wire pin is first attested by this name late 14c. Transferred sense of "leg" is recorded from 1520s and hold the older sense. Pin-money "annual sum allotted to a woman for personal expenses on dress, etc." is attested from 1620s. Pins and needles "tingling sensation" is from 1810. The sound of a pin dropping as a type of something all but silent is from 1775.
mid-14c., "to affix with a pin," from pin (n.). Figurative use from 1570s. Related: Pinned; pinning. Sense of "to hold someone or something down so he or it cannot escape" is attested from 1740. In U.S., as a reference to the bestowal of a fraternity pin on a female student as an indication of a relationship, it is attested by 1938. Phrase pin down "define" is from 1951.
acronym for personal identification number, 1981, from the first reference used with redundant number.
A thin rod for securing the ends of fractured bones.
A peg for fixing the crown to the root of a tooth.
A leg (1530+)