It's a similie, because it compares something to something else.
"My cat stood as still as a statue" means that it was like (or similar to) a statue.
You could have a metaphor that use the same imagery. So
"The instant it saw the mouse, my cat became a statue." This does not imply that the cat actually transformed into a statue, but it uses the metaphor of an unmoving thing to put an image into your head.
As still as a statue.
Well, honey, if Sam was sitting as still as a statue, then that's a simile, not a metaphor. A simile compares two things using "like" or "as," while a metaphor states that one thing is another. So next time, pay attention in English class, darling.
A metaphor
A metaphor, a simile uses the words like or as.
simile
that man
simile
simile
simile and METAPHOR AND PERSONIFICATION AND CHEESE
simile
simile
Its a metaphor