suss * out +
It took her ages to suss out what was going on.
He swanned about at the party.
She swanned around trying to impress people.
She swans in and out of the office as she pleases.
He just swanned off to the cinema when he should have been working.
swear by +
I swear by their products- they're the best on the market.
swear * in
使 (某人) 宣誓就職 (通常用被動態)
He was sworn in as prime minister.
The new president was sworn in.