He set the apples down and took her by (the arm) or (by arm).
If I used (by arm), are syntactic semantics acceptable? Does the meaning change?
He set the apples down and took her by (the arm) or (by arm).
If I used (by arm), are syntactic semantics acceptable? Does the meaning change?
You have to say "by the arm". "By arm" is not correct. It is not a matter of semantics or syntax, but of idiomaticity (ref.).
As an introduction, I will offer the following two definitions of idiomaticity:
(i) nativelike selection of expression (inspired by Pawley and Syder (1983))
(ii) that which one has to know over and above rules and words (inspired by Fillmore et al (1988))
…
Allerton (1989: 36), realizing that there are syntactically and lexically unmotivated "locutional co-occurrence restrictions", which a language-user needs to master, suggests that these justify the introduction of "idiomatics" as a special branch of lexicology.