have a firm understanding or knowledge of; be on top of | establish the validity of something, as by an example, explanation or experiment |
be careful or certain to do something; make certain of something | obtain probate of |
verify by using a duplicate register for comparison | prove formally; demonstrate by a mathematical, formal proof |
handle and cause to function | provide evidence for |
maintain influence over (others or oneself) skillfully, usually to one's advantage | take a trial impression of |
exercise authoritative control or power over | cause to puff up with a leaven |
lessen the intensity of; temper; hold in restraint; hold or keep within limits | increase in volume |
check or regulate (a scientific experiment) by conducting a parallel experiment or comparing with another standard | put to the test, as for its quality, or give experimental use to |
place under restrictions; limit access to by law | be shown or be found to be |