The term 'become blocked' can be described by four different crossword solutions: CLOG (4 letters), CLOT (4 letters), jamup (5 letters), and clogup (6 letters). CLOG is a verb meaning to become stopped up or blocked, usually by an accumulation of material. CLOT is a noun referring to a thick mass of material that has congealed together, often blocking a passage. Jamup is a verb meaning to become stuck or blocked, usually due to an obstruction. Finally, clogup is a verb meaning to become blocked or stopped up, usually due to an accumulation of material.