godan verb (-su), transitive verb
keep waiting; make wait
Transitive verb meaning to cause someone to wait. Often used when the speaker or subject is responsible for the delay. Compare with 待たせる, which is more common in standard Japanese; 待たす is a slightly more casual or dialectal variant.
See also: 待たせる (またせる)
友達を30分も待たしてしまった。
I ended up making my friend wait for 30 minutes.
お客
Don't keep the customers waiting too long.