butter face

bash someone's face in

To beat someone violently.

blow up in one's face

To fail disastrously.

Boat

[Cockney slang]face

via boat race

bread and butter

That which is central or fundamental, as to one's business, survival, or income; a staple or cornerstone.

break someone's face

To beat up someone violently.

butter one's bread on both sides

To profit from two things at the same time, especially when those things seem contradictory or incompatible.

butter the cony

To take advantage of an unmissable opportunity.

butter wouldn't melt in someone's mouth

The identified person appears to be benign, mild-mannered, or calm (but with an integral suggestion that, to the contrary, they really are untrustworthy, disagreeable, or mean-spirited).