"slipping" in the verb sense

1. steal, slip

move stealthily

"The ship slipped away in the darkness"

2. slip

insert inconspicuously or quickly or quietly

"He slipped some money into the waiter's hand"

3. skid, slip, slue, slew, slide

move obliquely or sideways, usually in an uncontrolled manner

"the wheels skidded against the sidewalk"

4. slip, drop off, drop away, fall away

get worse

"My grades are slipping"

5. slip

move smoothly and easily

"the bolt slipped into place"

"water slipped from the polished marble"

6. err, mistake, slip

to make a mistake or be incorrect

7. slip, sneak

pass on stealthily

"He slipped me the key when nobody was looking"

8. slip

move easily

"slip into something comfortable"

9. slip

cause to move with a smooth or sliding motion

"he slipped the bolt into place"

10. slip, slip one's mind

pass out of one's memory

11. dislocate, luxate, splay, slip

move out of position

"dislocate joints"

"the artificial hip joint luxated and had to be put back surgically"

"slipping" in the adjective sense

1. slipping, slithering

moving as on a slippery surface

"his slipping and slithering progress over the ice"

Source: WordNet® (An amazing lexical database of English)

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