Call Off
to cancel something that was planned, like an event or activity, usually because something changed or didn't go as expected.

Examples:
1 - They had to call off the outdoor picnic because of the heavy rain.
2 - The meeting was called off because the manager was not available.

Point:
1 - The teacher called off the test because many students were sick.
2 - The teacher called the test off because many students were sick.

Kill two birds with one stone
killing two birds with one stone means to achieve two goals or complete two tasks with a single action.

Examples: 
1 - By starting a vegetable garden, Jake teaches his children about gardening and saves money on groceries — killing two birds with one stone.
2 - Mia combined her business trip with a vacation, exploring a new city while attending meetings — killing two birds with one stone.

Easier said than done: 
Something is hard to do even though it seems simple when you talk about it.

Examples:
1 - Mark listens to audiobooks during his daily commute, enjoying literature while avoiding traffic stress — killing two birds with one stone.
2 - Mia combined her business trip with a vacation, exploring a new city while attending meetings — killing two birds with one stone.

People Person:
A people person is a person who enjoys being with other people and is good at working with them or talking to them.

Examples:
1 - She's a real people person and makes friends easily wherever she goes.
2 - She's always been a people person which makes her perfect for a job in customer service. 

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Procrastinate: To delay doing something, often because it seems difficult or unpleasant.

Examples:
1 - I always procrastinate cleaning the house until the last minute.
2 - Don't procrastinate paying your bills; it can lead to late fees and a bad credit score.

Ambitious:
Having a strong desire to achieve big goals or succeed.
An ambitious person really likes to become successful and does his or her best to achieve big goals.

Examples:
1 - She is very ambitious and dreams of becoming a CEO one day.
2 - The ambitious student set a goal to read fifty books by the end of the year.

Altruist:
Someone who selflessly cares about the well-being of others and often acts to help them without expecting anything in return.

Examples:
1 - Princess Diana was known as an altruist because of her kindness and charity work. She always helped poor people and supported people with AIDS.
2 - As an altruist, she donates clothes and blankets to homeless shelters every winter.

Serendipity:
Serendipity is when you unexpectedly find something good or pleasant without actively searching for it.

Examples:
1. Receiving a dream job offer during a random chat at a party was a life-changing moment of serendipity.
2. It was pure serendipity that I found my old friend in a city so far from home.
3. It was pure serendipity when I found my lost earring while digging in the garden.

A Blessing in Disguise:
We use blessing in disguise when we want to talk about sth that seems bad or unlucky at first, but results in something good or beneficial later.

Examples:
1- Losing my job was a blessing in disguise. It pushed me to pursue my passion for photography, and now I have a successful business doing what I love.
2- My car breaking down on the way to work was a blessing in disguise. While waiting for a mechanic, I met an old friend who offered me a better job opportunity.