The noun overflow has 2 senses (first 1 from tagged texts)
1. (1) flood, overflow, outpouring -- (a large flow)
2. overflow, runoff, overspill -- (the occurrence of surplus liquid (as water) exceeding the limit or capacity)
Overview of verb overflow
The verb overflow has 2 senses (first 1 from tagged texts)
1. (2) overflow, overrun, well over, run over, brim over -- (flow or run over (a limit or brim))
2. bubble over, overflow, spill over -- (overflow with a certain feeling; "The children bubbled over with joy"; "My boss was bubbling over with anger")