How to use Act up in a sentence
When bullets whiz by and hit things, the speakers act up.
Apparently the horse knew the rider meant business, because it didn't act up again.
The new doctrine, loudly proclaiming the discovery of a " Natural" System, led away many from the steady practice which should have followed the teaching of Cuvier (though he in ornithology had not been able to act up to the principles he had lain down) and from the extended study of Comparative Anatomy.
He had, however, the courage to act up to his own professions in collocating the rollers (Coracias) with the beeeaters (Merops), and had the sagacity to surmise that Menura was not a Gallinaceous bird.
On the 16th of September his disapproval of the popular excesses at Warsaw caused him to quit the government after sacrificing half his fortune to the national cause; but it must be admitted that throughout the insurrection he did not act up to his great reputation.Advertisement
It was not founded on any intuitive ideas of right and wrong, nor was it fashioned upon any outward experiences of time and place, but it was formed entirely on what he held to be the revelation of the will of God in the written word, and throughout all his life his faith led him to act up to the very letter of it."
Urged by his Circassian mother, the sultan sought advice and counsel from Europe and endeavoured to act up to it.
I also felt the demands of activists in ACT UP had become repetitive.
My husband has cat allergies, but they do not act up all the time.