English ⇄ Russian

can't make heads or tails of stresses
amer.	не в состоянии понять (John is so strange. I can't make heads or tails of him. Val_Ships)
can't make head or tail of
busin.	быть не в состоянии понять (smth, чего-л.)

can't make heads or tails of: 2 phrases in 2 subjects

American usage, not spelling	1
Idiomatic	1