Watch the step 
          : Move / Act carefully

Watch the tongue
          : Speak carefully

Word by word
          : Very word

With eyes open
          : Fully aware when doing something

Within a stone throw
          : Withing a very short distance

Wet behind the ears
          : Naive / no experience

Wide of the mark
          : Incorrect / Inaccurate

Watching paint dry
          : Boring / not interesting at all