Keep up with your sharpening; don't let your knife get dull.

Keep sex drive all bottled up inside and you get dull-witted.

I'm saving that until after the holidays, when things get dull.

You guys eat hotdogs while I get dull, dry dog food.

Too little action and the pace slows down and the story can get dull.

Razors get dull very quickly, and the face gets sore.

In 1866 when the war was coming to an end, trade began to get dull.

It's a cliche but grey weather does get dull.

The eyes get dull, the face thin and sallow, the complexion bad, and the flesh flabby.

Fortunately, there is a file in my tool-kit, and if my claws get dull they can be sharpened again.

I must think of all the little things I can to liven her up so she won't get dull.

I make new ones now and then, when the old ones get dull, but I like the old ones best myself.

We were all sorry when she went, but were not allowed to get dull, for almost immediately afterwards the concert began.

Phrased another way, "If you let a knife get dull, it takes a lot longer to resharpen than one kept sharp."

The government is expected to publish its Operation Yellowhammer report about the impact of a no-deal Brexit later, so it won't get dull.

They're fun to play and, despite sticking to some tried and tested formulas, have yet to get dull -for me at least.