Have bigger fish to fry.
To have more important things to do.
Example: Johnny doesn't want to waste his time washing the dishes because has bigger fish to fry.
Beat around the bush.
To avoid speaking about what's important.
Example: After damaging his brother's car, Johnny beat around the bush instead of explaining clearly what had happened.
Read between the lines.
To discern the real meaning behind something without it being said clearly.
Example: When my wife pointed out the red dress in the shop window, I read between the lines and discerned that she wanted me to buy it for her.
Look before you leap.
Think about potential risks before carrying out a decision.
Example: Before making a big purchase, it's best to look before you leap to avoid future regrets.
Get your act together.
To make the necessary adjustments to improve oneself or to do something more effectively.
Example: Your brother has to get his act together if he wants to keep his job.