pin down

1.钉住,压住;2.使受约束,牵制;3.准确说明

pillar, pillar-box, pillbox, pillion, pillory, pillow, pillow-fight, pillowcase (also `pillowslip), pilot, Pilot Officer, pilot-boat, pilot-fish, pilot-light (also `pilot-burner), pimento, pimp, pimpernel, pimple, pimpled, pimply, pin, pin-ball, pin-head, pin-money, pin-stripe, pin-table, pin-up, pinafore, pinafore dress, pince-nez, pincer, pincer movement, pinch, pinchbeck, pinched, pincushion, pine, pine-cone, pine-needle, pineal, pineal gland,