collect, gather, be in arrears
溜 centers on accumulation: collecting or gathering things together, or falling behind as payments pile up.
溜 combines 氵 (water) with 留 (stop, detain), suggesting water that is detained or collected in one place. The exact historical development of the compound is uncertain.
Water 氵 detained 留 in a basin: it collects and gathers there, like unpaid bills piling up.
For リュウ, imagine a flowing river (流, りゅう) that collects water in a pool: 流 -> リュウ, and the water gathers there.
to collect; to gather; to save; to accumulate; to pile up
to amass; to accumulate; to store
pile; pool; collection
gathering spot; haunt; rendezvous; meeting place; hang-out
cesspool; sink; manure sink
reservoir; pond
rubbish heap; garbage dump
to save up; to stockpile; to stash away; to hoard; to amass; to salt away
tank for holding human waste (used for fertilizer); night-soil reservoir; cesspool; cesspit
acid reflux; bile reflux; pyrosis; stomach acid (when it enters the esophagus); heartburn; indigestion; water brash
drift (of snow, leaves, etc.)
accumulation of gas; gas pocket
garbage dump; scrap heap; rubbish dump; dump; dumpsite
magma reservoir
holding out for a short while; putting up resistance for a while; briefly holding one's own
unable to put up any resistance; unable to put up a fight; not standing a chance (against)
easily (beaten, destroyed, etc.); without difficulty; helplessly; without the least resistance
dry distillation
when the right conditions are fulfilled, things will turn out well on their own; a sunken place will collect water
cracking