to take action in order to be sure that something happens or to be sure that it is true

to make the result of something certain

verb

to tell someone, usually by writing or telephoning, that something will definitely happen at the time or in the way that has been arranged

verb

to become definite or easily understood, or to make something definite or easily understood

verb

if a thought or idea gels, it becomes clearer or more definite

verb

to become more definite, or to make something more definite

verb

to tell someone that something will definitely happen or is definitely true, especially in order to remove doubt about it

verb

to show clearly that something is important or true

verb

to make a situation, process, or type of behaviour stronger and more likely to continue

verb

to make a feeling, decision, relationship etc stronger or more powerful