tl;dr: Use command in front of the desired command.

For example, let's figure that we assigned an alias to echo, like this:

alias echo="ping"

What happens if we launch the command?

$ echo

# Output
# > PING ( 56(84) bytes of data.
# ...

In order to make the shell ignore the alias and launching the actual command, we have to make command precede the desired command (e.g. echo).

$ command echo

# Output
# >

$ command echo "hi man"

# Output
# > ciao mbare