make heads or tails of
US /meɪk hɛdz ɔr teɪlz əv/
UK /meɪk hɛdz ɔr teɪlz əv/
1.
to understand something at all, especially something confusing or difficult
:
•
I can't make heads or tails of these instructions.
•
The doctor's handwriting was so bad, I couldn't make heads or tails of the prescription.