Expand Your Vocabulary with these Synonyms for "More Chock-a-block" If you want to convey the idea of something being densely packed or crowded, you might use the phrase "chock-a-block." For example, "The concert was chock-a-block with excited fans." But what if you need to emphasize that the space is extremely full, beyond the usual chock-a-block level? Here are some synonyms you can try: 1. Bursting at the seams - This phrase suggests that the object or place is so full that it seems to be about to burst or split open. "The suitcase was bursting at the seams with souvenirs." 2. Jam-packed - This term literally describes a container or vehicle that is packed with jam or any other substance. It means tightly packed or full to capacity. "The subway car was jam-packed with commuters during rush hour".