blur – n. something that is difficult to remember
irregular – adj. not following the normal patterns by which word forms (such as the past tenses of verbs) are usually created
literal – adj. involving the ordinary or usual meaning of a word
idiomatic – adj. an expression that cannot be understood from the meanings of its separate words but that has a separate meaning of its own
noun phrase – n. a group of words that acts like a noun in a sentence
polite – adj. having or showing good manners or respect for other people
tense – n. a form of a verb suggesting time or length of action
grammar – n. the study of words and their uses in a sentence
dozen – n. a group of 12