enhanceable

Hence they deduce an exemption from the duty on tea, which notwithstanding the refinements and distinctions that have been made, and whether paid in America or Britain, so long as the trade in that article is confined to Britain, is clearly a tax on them, which conceded to is enhanceable at pleasure, and may be extended to every other article of commerce.

1773 December 13, “James Bowdoin to John Temple”, in Collections of the Massachusetts Historical Society, sixth series, volume IX, Boston, Mass.: […] the Society, published 1897, page 329

[…]regarded their tenures entitled to the same privileges as those of mocurreedars occupying lands at a fixed jumma from 12 years prior to the Decennial Settlement, and of others who held land, from the time of the Decennial Settlement at enhanceable rent, but at fixed rates,—yet, those innovations were nothing but the enactment of the usages prevailing at the time.

1865, a Lover of Justice [i.e., John Cochrane], The Permanent Settlement Imperilled; or, Act X. of 1859 in Its True Colors, Calcutta: […] the “Englishman” Press, […], →OCLC, page 21

Whereas, the State Hate Crimes provision, Iowa Code Chapter 729A, enhances the penalty for certain crimes when they are committed because of a person’s race, color, religion, ancestry, national origin, political affiliation, sex, sexual orientation, age or disability, but harassment and trespass with the intent to harass are not included as enhanceable offenses;[…]

2019 June 27, Iowa City Press-Citizen, volume 179, number 153, page 4B