pin down

phrasal verb
1
to make somebody unable to move by holding them with a lot of force
زمین‌گیر کردن, بی‌حرکت کردن, محکم گرفتن
2
to find somebody and make them answer a question or tell you something you need to know
مجبور به پاسخ کردن, پاسخ گرفتن از, گرفتن کسی به حرف
I need the up-to-date sales figures but I can never pin him down at the office.
3
to make somebody make a decision or say clearly what they think or what they intend to do
وادار کردن به تصمیم‌گیری, ملزم کردن, ملزم به تصمیم گیری کردن
It's difficult to pin her down to fixing a date for a meeting.
4
to explain or understand something exactly
توضیح‌دادن دقیق, تشریح کردن, مشخص کردن, تبیین کردن
The cause of the disease is difficult to pin down precisely.
The difference between the two approaches is hard to pin down precisely.