to find time to see someone or do something between various other arrangements that have already been made: Doctor Meredith is busy this morning, but she might be able to slot you in around one o'clock. SMART Vocabulary: related words and phrases.

A slot is a narrow opening in a machine or container, for example a hole that you put coins in to make a machine work. He dropped a coin into the slot and dialled the number. If you slot something into something else, or if it slots into it, you put it into a space where it fits. He was slotting a CD into a CD player.