【明報專訊】◆bread and butter

It refers to an activity by which somebody makes a living.

e.g. Please don't fire me! This job is my bread and butter.

◆butter up

It means "to please somebody with a lot of good words".

e.g. Having buttered up his boss, he got promoted.

◆a knife through butter

It means "without obstacles".

e.g. The construction work was finished like a knife through butter.

[Smarties' Power English 第233期]