To introduce by gradual, persistent efforts; implant: "Morality . . . may be instilled into their minds” ( Thomas Jefferson).
To pour in (medicine, for example) drop by drop.
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.