Third-person singular simple present indicative form of increase.(verb)
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Use "increaseth" in a sentence
"He that by unjust gain increaseth his substance shall gather it for him that will pity the poor, Prov. xxviii."
"8 He that by usury and unjust gain increaseth his substance, he shall gather it for him that will pity the poor."
"Quite a long diary entry from yesterday, but I particularly loved these two bits which appealed in different ways to my appreciation of the history of science: at noon to Sir Philip Warwicke's to dinner, where abundance of company come in unexpectedly; and here I saw one pretty piece of household stuff, as the company increaseth, to put a larger leaf upon an oval table."