Lay wait for verb phrase
When someone/something lays wait for, he/she/it is hiding to prepare for a surprise attack, ambush.
The tiger is laying wait for the deer. He has had nothing in his stomach for all day, so he is starving.
The Vietnamese troops were very skillful and clever to use leaves to camouflage and then laid wait for their enemies.
I knew my sister was laying wait for me behind the door to scare me, so I just pretended to be frighten when she jumped out.
A sudden attack; a hidden danger
If you say you dry gulch one, you mean that you hide and wait for him and then make a sudden attack.
This phrase should be conjugated according to its Subject and Tense.
It was often said by a photographer when he would like small children to look at the camera and smile before he took a photo.
When the photographer said “watch the birdie”, all of us looked at the camera and smiled.