Drop off is a phrase that means to let something or someone fall, or deliver a product or person to a certain area. The synonyms for drop off could mean the same thing, but in a different or more specific context. For instance, "deposit" indicates a financial context, such as putting money in a bank. "Leave" and "bid farewell" are commonly used when referring to departing someone or something. "Decrease" and "decline" may be utilised to express a drop or reduction in figures or statistics. "Nod off" is often used to informally describe the act of falling asleep or drifting into a dreamlike state.