Idiomatic expressions

[126]

Hello

Could anybody explain the meaning of these idiomatic expressions to me?

1 as smooth as honey
2 have the edge over
3 not to be sniffed at

[RonBee]

as smooth as honey - quite smooth; Her voice was as smooth as honey.

have the edge over - have the advantage of

not to be sniffed at - not to be ignored; significant; A milion dollars is an amount not to be sniffed at.