lick (your) lips

to feel pleased and excited about something that is going to happen, usually because you think you will get something good from it.

Meanwhile, the property developers are licking their lips at the prospect of all the money they're going to make.

• know the drill
• know the first thing about
• know the first thing about something
• know the half of it
• know the meaning of the word
• know the ropes
• know the score
• know through and through
• know way around
• know way around something
• know way around somewhere
• know what are doing
• know what are talking about
• know what hit
• know what hit you
• know what's what
• know what you are doing
• know what you are talking about
• know where stand
• know where to put
• know where to put yourself
• know where you stand
• know whether are coming or going
• know whether to laugh or cry
• know whether you are coming or going