The term PART OF A SENTENCE ABBR. refers to the abbreviations used to represent the four main components of a sentence: OBJ (Object), PHR (Phrase), PRED (Predicate), and SUBJ (Subject). An object is a noun or pronoun that receives the action of the verb in a sentence, while a phrase is a group of words that does not contain a subject and verb. The predicate is the part of a sentence that contains the verb and expresses the action or state of being of the subject. Finally, the subject is the person, place, thing, or idea that is performing the action or is being described in the sentence.