to drop a line

to drop (someone) a line: to write a note to someone Examples of TO DROP A LINE Please feel free to drop me a line with any of your thoughts regarding the page. I’ll try to get it up tomorrow, and will drop you a line when it’s available.  

to stop by

to stop by: to visit or stop somewhere briefly in order to do something Examples of TO STOP BY   Stop by and learn how you might be able to make a difference for your neighbors. If we stop by the house at dinnertime, Mom says she’s already eaten and is full.

to hold on

to hold on: to grasp tightly or firmly; to wait, to be patient Examples of TO HOLD ON They don’t give up and they hold on to hope that things are going to get better. He finally broke off and told her to hold on a second because Daddy was talking.

to be well-off

to be well-off: to have enough money to enjoy a comfortable life, to be rich(also: to be well-to-do) Examples of TO BE WELL-OFF The ironic result is that some well-off private schools are now getting support.The well-to-do son of a banker, Degas visited the Paris Opera-Ballet frequently.

to take apart

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.