The verb "to slither" means to slide along, unsteadily or with an irregular slipping motion. (To slide means to move along a surface with continuous contact on that surface; ie, as when moving over ice, you don't lift your feet but keep them continuously on the ice.)
The word is most commonly used to describe the movement of snakes, worms or anything that moves along the ground without legs. It is a regular verb, so -ed would indicate that the verb is in the past tense.
An example sentence might be:
The snake slithered along the ground.
There is also a noun, slither ("Snakes move in a continuous slither") although this is unusual. The adjective is slithery ("a slithery snake.")
The word is most commonly used to describe the movement of snakes, worms or anything that moves along the ground without legs. It is a regular verb, so -ed would indicate that the verb is in the past tense.
An example sentence might be:
The snake slithered along the ground.
There is also a noun, slither ("Snakes move in a continuous slither") although this is unusual. The adjective is slithery ("a slithery snake.")