to know by sight: to recognize Examples of TO KNOW BY SIGHT I had a look around but as Jarrod’s Dad is the only one I know by sight it was a bit of a forlorn hope. If everybody doesn’t know everybody by name they’ll certainly know each other by sight.

to knock one self out: to work very hard (sometimes too hard) to do somethingA reflexive pronoun must divide the idiom. Examples of TO KNOCK ONE SELF OUT She really knocked herself out trying to pass that difficult class. Don’t knock yourself out during practice. Save your strength for the competition later.

to take off: to remove (usually said of clothes) Examples of TAKE OFF The chef forgot to take off his apron when he sat down to eat. With his diet, he was hoping to take off some weight before his vacation at the beach.

to turn out: to become or result; to appear, to attend (also: to come out) Examples of TO TURN OUT The Judge threatened the young boy with a long time in jail, only because the Judge wanted him to turn out to be a model citizen. Because I hadn’t built furniture before, I wasn’t expecting…

a lost cause: a hopeless case, a person or situation having no hope of positivechange. Examples of A LOST CAUSE Repeat these steps as necessary to remove the stain, but it may be a lost cause. Even this late in the game, the search for the black boxes is not a lost cause.

to keep out: not to enter, not allow to enter Examples of TO KEEP OUT She ignored the sign saying to keep out of the spooky warehouse and it didn’t end well. I’ve told you to keep the dog out of the house.