transitive verb overran -·ran′, overrun -·run′, overrunning -·run′·ning

1. to run or spread out over so as to cover
2. to infest or swarm over, as vermin, or rove over and ravage, as an invading army
3. to invade, defeat, or conquer by a rapid, broad advance
4. to spread swiftly throughout, as ideas, a fad, etc.
5. to run or extend beyond (certain limits) to overrun second base
6. Archaic to outrun
7. Printing
   1. to rearrange (type matter) by shifting from one line to another
   2. to print more copies of (a given work) than ordered

intransitive verb

1. to overflow
2. to run over or beyond certain limits

noun

1. the act or an instance of overrunning
2. the amount of money by which a product or project exceeds its estimated cost
3. an excess amount produced, as of manufactured goods or copies of printed matter