decrease — When something decreases or when you decrease it, it becomes less in quantity, size, or intensity.
abbreviate — If you abbreviate something, especially a word or a piece of writing, you make it shorter.
abridge — to reduce the length of (a written work) by condensing or rewriting
compress — When you compress something or when it compresses, it is pressed or squeezed so that it takes up less space.
contract — A contract is a legal agreement, usually between two companies or between an employer and employee, which involves doing work for a stated sum of money.
cut — If you cut something, you use a knife or a similar tool to divide it into pieces, or to mark it or damage it. If you cut a shape or a hole in something, you make the shape or hole by using a knife or similar tool.
diminish — to make or cause to seem smaller, less, less important, etc.; lessen; reduce.
halt — to falter, as in speech, reasoning, etc.; be hesitant; stumble.
shrink — to draw back, as in retreat or avoidance: to shrink from danger; to shrink from contact.
stop — to cease from, leave off, or discontinue: to stop running.
constrict — If a part of your body, especially your throat, is constricted or if it constricts, something causes it to become narrower.
decline — If something declines, it becomes less in quantity, importance, or strength.
drop — a small quantity of liquid that falls or is produced in a more or less spherical mass; a liquid globule.
fall — to come or drop down suddenly to a lower position, especially to leave a standing or erect position suddenly, whether voluntarily or not: to fall on one's knees.
simplify — to make less complex or complicated; make plainer or easier: to simplify a problem.
slump — to drop or fall heavily; collapse: Suddenly she slumped to the floor.
condense — If you condense something, especially a piece of writing or speech, you make it shorter, usually by including only the most important parts.
curtail — If you curtail something, you reduce or limit it.