Press together phrase
To use force to push two or more people or things closely against each other.
When I leaned over to feed the kid, he pressed his lips together and pulled away.
I left the room when my sister and her boyfriend started pressing their noses and foreheads together.
He applied a liquid adhesive to some pieces of the broken vase and pressed them together.
The verb "press" must be conjugated according to its tense.
The origin of this phrase is not clear.
If you fall for someone's trick the first time then they are at fault.
Are you going to mess with me again? Fool me once, shame on you; fool me twice, shame on me.