look in on (inseparable): visit in order to check something's / someone's condition.
"My father just came home from the hospital. I plan to look in on him today after I finish work."
look into (inseparable): investigate / get more details about something.
"Someone said there was a meeting at 9:30 but I haven't heard anything about it. Shall I look into it?"
look like (inseparable): resemble (in appearance).
"Does he look like his father or his mother?"
look over (separable): check; review.
"I think I may have some typos in this report. Could you look it over?"
look up (1. separable): find something in a reference work.
"I'm sorry, but I don't know what that word means. I'll have to look it up."
look up (2. separable): find where someone lives or works and visit him/her.
"Thanks for giving me your brother's address. When I'm in Chicago next month, I'll be sure to look him up."
look up to (inseparable): respect.
"Everyone looks up to Joyce because she always makes time to help others."
luck out (no object): be unexpectedly lucky.
"Gloria was worried because she wasn't prepared to give a report at the meeting, but she lucked out because the meeting was postponed.
a lap tetejére