Cambridge International Dictionary of idioms. Harper Collins Longman dictionary of English idioms. The American Heritage Dictionary of idioms . A dictionary of American idioms. The vocabulary of English contains many expressions that are semi-fixed, or partially variable, in their form.
Some idiom dictionaries contain a good deal of grammatical information.
For the most part this is information about syntax. The state should foot the bill. George had spilled the beans. Some idioms get shortened and are used in their truncated form in everyday speech. Sometimes, idioms are refashioned by native speakers to achieve a variety of effects.