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1. To place, insert, or load someone or something inside of something else. In this usage, a noun or pronoun can be used between "slip" and "in." Go up to their mailbox and slip in this letter. He slipped a new magazine in and cocked the rifle.
2. To enter (something or some place) quickly, easily, or inconspicuously. The teacher had already started his roll call, but Josh managed to slip in without him noticing. I hate trying to slip in my sleeping bag without waking other people.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
slip something in (to) somethingand slip something in
to cause something to slide or glide into something. Max slipped the bullets into their chambers and got ready to fire. He slipped the bullets in silently.
(some place) to sneak or go into a place quietly and unnoticed. I think we can slip in the rear door unnoticed. We slipped in and crept up the stairs.
slip in(to something)
to slide or glide into something, such as clothing, a sleeping bag, a tight place, etc. I don't want to slip into a cold sleeping bag. How can I warm it up? I opened the bag and slipped in.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
1. To insert something gradually, easily, or without being noticed: She took a dollar bill and slipped it in the birthday card. He slipped in a comment during their conversation.
2. To enter gradually, easily, or without being noticed: The party had already started, so I slipped in and got a drink. The thief slipped in the back door.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.