He tried to keep a straight face although he thought what she had done was very silly and stupid.
can't keep a straight face :P
The idiom "keep an eye out for" refers to watching for something or someone. An example of a sentence using the idiom would be: Jeff should be arriving soon, so keep an eye out for him.
Keep watch on.
A "stitch" is a sudden sharp pain in your side. You often get them when you're running. However, you can also get them if you laugh really, really hard. Thus, if someone "keeps you in stitches" they keep you laughing so hard that your sides ache.
Yes they can. Their sexual orientation doesn't affect how they present facial expressions.
This is not an idiom - it means exactly what it says. You should stay fit and healthy.
Dont look straight on his face/eyes . KEEP YOU FACE TURNED TOWARD SOMETHING ELSE , while talking to someone you hate.
Easy. Dont get it wet! If your hair gets wet, it gets stickey and curley. Its gross sometimes. You can also buy shampoos and conditioners to keep your hair straight. Most salons sell straight hair products to keep your hair straight all day withput your hair getting greasy or hard.
It is just an idiom and has no history.
That's not an idiom. Keeping a matter secret means not letting anyone know about it.
keep your chin up!