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.
Used when something unpleasant has happened that has spoilt what you intended to do
Oh, no, that’s torn it! I’ve left my wallet at home!