What is " on short notice ", thank you! context: “Ridesharing is a service that arranges one-time shared rides on very short notice, usually arranged through a smartphone app.”

is due to, thanks context: "He added that the idea of anonymous CVs had already been tested in France where the country's National Assembly is due to consider making the practice mandatory for all firms with more than 50 employees" " the country's National Assembly is due to consider....", what does it mean? Thank you!

Can you please help me with the questions? Thank you! context: 1. Supermarket drops £10m five-year programme as official statistics show average family throws away £700 of food each year. 2. Sainsbury’s launched its “Waste Less, Save More” programme in 2016 – a £10m five-year plan to help customers save money by reducing their food waste. Q: Does"£10m five-year programme " mean the organization provides the money to achieve a goal within five years? "drop" means stop here right? 3. Supermarket giant Sainsbury’s has dropped an ambitious target to get consumers to halve their household food waste...... Q: I just found "drop"means stop in the dictionary. However in this case it seems like it means "set"?

"taboo of heartbreak" Context: “Huerta is a former Googler and originally founded Mend as a newsletter about moving on from a breakup. Heurta told The Times that she hopes to "erase the shame and taboo of heartbreak as something to just get over."" What is "taboo of heartbreak "? Thank you for your time!

What is "workplace undermining"? Thank you! Context: Burning an additional 587 calories, the equivalent of a 90-minute brisk walk or an hour-long swim for a 195-pound male, can “substantially reduce the harmful effects of workplace undermining,” they wrote.

out of curious

I watched many English TV series and found that actors and actress would be very famous if that show was successful. However they seldom join other TV series. I mean a very famous actor and actress ( due to a successful TV series ) maybe only have that one work ( I mean TV series, not movies) . Often they grow with that show, which may last many seasons, i.e. many years. Is that a reason?

In China, if an actor and actress becomes well known because of the TV series they've performed, and then tons of other TV series projects would love to invite them to be the main characters in order to attract their fans. As a result, possibly you will see one actor or actress plays in more than  50% TV series. China's TV series generally just have 30-50 episode per season, and at most have 2 seasons.

"join". Thank you! "Join" and "join in", in some cases, they mean the same thing. "We only need one more player for this game - can you persuade your sister to join in?". "Why don't you ask your sister if she would like to join us for supper?" In these two cases, "join" and "join in" are replaceable, right?

What does " wouldn't rather.."mean? Thank you very much! context: "Look, why don't I go and speak to him and see if wouldn't rather have Gordon's duck egg and polenta fries."

"expect sb" and "expect from sb" What's the difference between them. Thank you!