When you need to express a sense of urgency or immediacy, there are a variety of synonyms for the phrase "in a jiff." Alternatives include "in a flash," "in no time," "in an instant," "in a snap," "in a twinkling," "in a shake," and "in the blink of an eye." Other options include "in a split second," "in a hurry," "at once," "right away," and "pronto." Each of these phrases implies that something must be done quickly or that time is of the essence. When composing text or speaking, consider using one of these synonyms to add urgency or emphasis to your message.