/chok"euh blok"/ , adj.
1. extremely full; crowded; jammed: a room chockablock with furniture and plants.
2. Naut. having the blocks drawn close together, as when the tackle is hauled to the utmost.
adv.
3. in a crowded manner: books piled chockablock on the narrow shelf.
Also, chock-a-block .
[ cf. chock close (up to), appar. as back formation from CHOCKFUL ]