tell a thing or two

What's more," he said, "I could tell a thing or two.

Roscoe, his cicerone, had contrived to learn a little of the difficult Burmese language, and knew the town to a certain extent—including something of the vast underworld, and even FitzGerald admitted that "old man Roscoe" could tell a thing or two, if he liked.

They know, and they could tell, a thing or two which would paralyse belief.

Ee was certain, ee said, as you could tell a thing or two about them coverts at Tudley End, if the treuth were known.

"I'll tell a thing or two to the rascally fellow," replied Doña Casiana.