These figures of speech may omit letters, syllables, words, or ideas. They may even just include a pause for silence.
Deliberate sentence fragment. “No, not an oath! If not the face of men, / The sufferance of our souls, the time’s abuse— / If these be motives weak, break off betimes, / And every man hence to his idle bed;” Julius Caesar, 2.1.124
Deletion a syllable or letter from the beginning of a word to create a new word. “O thou dull god, why liest thou with the vile / In loathsome beds, and leav’st the kingly couch / A watch-case or a common ‘larum-bell?” Henry IV Pt2, 3.1.3. Also see Syncope, the removal of a syllable or letter from the middle of a word, and Apocope, the deletion of a syllable or letter from the end of a word.
An expression of insincere doubt, in which the writer or speaker pretends not to know a key piece of information or not to understand a key connection. “They that have done this deed are honorable. / What private griefs they have, alas, I know not, / That made them do it.” Julius Caesar, 3.2.82.
Sudden breaking off of an utterance before it is completed, usually in moments of emotion. “O judgment! Thou art fled to brutish beasts, / And men have lost their reason. Bear with me, / My heart is in the coffin there with Caesar, / And I must pause till it come back to me…” Julius Caesar, 3.2.82.
A break or pause in the rhythm of a line. The pause adds a dramatic effect. The pauses can be initial, medial or terminal, and may follow masculine or feminine stresses. “To be, || or not to be, || that is the question. ||” Hamlet. 3.1.64.
Omission of one or more words, which are assumed by the listener or reader. Omitting a word implied by the previous clause. “If to do were as easy as to know what were good to do, chapels had been churches, and poor men’s cottages princes’ palaces.” Merchant of Venice, 1.2.1
An argument in which a premise is omitted but implied, or which bases a conclusion on the truth of its contrary. “Marked you his words? He would not take the crown; / Therefore ’tis certain he was not ambitious.” Julius Caesar, 3.2.82
Metaplasmus (or metaplasm) is a generic term for a number of figures of speech that change the spelling of words by either adding or deleting letters or syllables. Shakespeare often used these figures to accommodate the meter of his lines. Sometimes he creates dialect. See Prosthesis (adding to beginning), Epenthesis (adding to middle), Proparalepsis (adding to end), Aphaearesis (deleting from beginning), Syncope (deleting from middle), Apocope (deleting from end).
Emphasizing a point by seeming to pass over it.