once in a blue moon: rarely, infrequently Examples of ONCE IN A BLUE MOON If once in a blue moon he smiled, it was such a rarity that it was like a scoop. These are discouraging times, but once in a blue moon a bit of hope appears.

touch and go: risky, uncertain until the end Examples of TOUCH AND GO The outcome of the soccer final was touch and go for the entire match. It was touch and go at one stage whether I would make the journey to hospital.

to make friends: to become friendly with others Examples of MAKE FRIENDS Once you’re done with college, it’s hard to make friends, but it isn’t impossible. The kittens approached each other tentatively, hoping to make friends.  

to take apart: to disassemble, to separate the parts of something Examples of TO TAKE APART He’d have to take it apart each winter and put it back together again by spring. As a child, Gary used to take doorknobs apart and put them back together.

to get back: to return Examples of GET BACK We’ll need to get back to headquarters, now that we’ve finished our mission. I like to get back to my hometown in the suburbs every couple of weeks, to visit my parents and to catch up with old friends.

to run away: to leave without permission; to escape Examples of TO RUN AWAY Police said three suspects ran away, but one was arrested in the immediate area. Someone who runs away becomes a coward, while someone who fears nothing is rash.