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1. To move accidentally out of a particular position and back to a previous one. The latch covering the control panel keeps slipping back. We'll need to fasten it in place somehow.
2. To return to a previous or lower position of value, especially unexpectedly. The stock jumped up on Sunday, before slipping back into negative territory.
3. To return something to a previous or rightful location, especially surreptitiously or inconspicuously. In this usage, a noun or pronoun is used between "slip" and "back." I took my mom's phone out of her wallet and slipped it back as soon as I had made the phone call. I didn't feel comfortable accepting the gift, so I slipped the money back in my dad's wallet when he wasn't looking.
4. To return to some location, especially surreptitiously or inconspicuously. I snuck out to go to my friend's party, hoping to slip back without my parents noticing. We'd better slip back to the office before we get in trouble with the boss.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
slip something back
1. to pull or place something back. Alice slipped the gearshift lever back and away they went. She slipped back the gearshift and sped away.
2. to return something secretively. Someone took my wallet away and slipped it back later. The thief slipped back my wallet, but the money was gone.
slip back (to someone or something)
to move quietly and cautiously back to someone or something. Walter slipped back to Sally when her parents weren't looking. He slipped back and then Mary's parents slipped back, and there was quite a scene.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.