A phrase that combines a verb with a preposition or adverb or both and that functions as a verb whose meaning is different from the combined meanings of the individual words
Phrasal Verb:
pin something down and nail something down
Meaning / Example:
1. to attach or affix something with nails or pins. > Pin the pattern down temporarily. > Nail down this piece of flooring every 12 inches.
2. to determine or fix something, such as a date, an agreement, an amount of money, a decision, etc. > It will be ready sometime next month. I can't pin the date down just yet, however.