1. Moving as on a slippery surface
   "his slipping and slithering progress over the ice";
   - slithering

1. Move obliquely or sideways, usually in an uncontrolled manner
   "the wheels slipped against the pavement";
   - skid, slue, slew, slide
    
2. Move stealthily
   "The ship slipped away in the darkness";
   - steal
    
3. Insert inconspicuously, quickly or quietly
   "He slipped some money into the waiter's hand"
    
4. Move smoothly and easily
   "the bolt slipped into place"; "water slipped from the polished marble"
    
5. To make a mistake or be incorrect
   "His tongue slipped, revealing the secret";
   - err, mistake
    
6. Cause to move with a smooth or sliding motion
   "he slipped the bolt into place"
    
7. Fall to a lower standard
   "My grades are slipping";
   - drop off, drop away, fall away
    
8. Pass on stealthily
   "He slipped me the key when nobody was looking";
   - sneak
    
9. (of clothes) quickly put on or take off
   "slip into something comfortable"
    
10. Be forgotten temporarily
    "The appointment slipped my mind"; "Her birthday slipped from his memory";
    - slip one's mind
     
11. Move out of position
    "The rug slipped on the polished floor";
    - dislocate, luxate, splay

See also: fall, go along, slip out, slippery, slippy [Brit, informal], stumble

Type of: act, blank out, block, break loose, decline, displace, disremember [US, informal], draw a blank, enclose, escape, forget, get away, give, glide, hand, inclose, insert, introduce, move, pass, pass on, put in, reach, stick in, turn over, worsen

Encyclopedia: Slipping