The phrase "in luck" means to have good fortune or be fortunate in a particular situation. Similar phrases that convey a similar meaning include "fortunate," "lucky," "blessed," "privileged," "prosperous," and "well-off." Other phrases that can be used as synonyms for "in luck" include "on the upswing," "in a good position," "success is on their side," "doing well," and "in a good spot." These phrases indicate that someone is experiencing success or happiness in their current situation, and can be used interchangeably with "in luck" depending on the context. Whether it's standing in the right place at the right time or having favorable circumstances, being "in luck" can be a positive experience, and there are several ways to express it.