1. Solve by trial and error: The trying of one thing or another until something succeeds.
Adjective: Many drugs were solve by trial and error.
2. Strengthen your concentration: It means strengthening the brain.
Noun: When you study you strengthen your concentrations.
3. Thing (something) through: Things that occur through something else.
Adjective: The jewelry is given through gold.
4. Think outside the box: I am trying to think outside the box to make this event a success.
Noun: Think Differently
5. Work (something) out: To resolve a tricky problem or situation.
Noun: Well, if you inclined to work something out, that's one thing.
6. Be in two minds: Not decided or certain about something
Noun: You seem to be in two minds.
7. By word of mouth: By being told by another person
Noun: Others heard about the march by word of mouth.
8. Follow your head/heart: Embrace having both your head and heart to rely on.
Noun: Do what you think is right in your head think about it very well.
9. Have your feet on the ground: To be a sensible and practical person.
Noun: With fame you have to have your feet on the ground.
10. Have your head in the clouds: live on dreams.
Noun: Since you're in love you have your head in the clouds.
11. In your mind's eye: in one's imagination or memory.
Noun: That project is in your mind's eye.
12. Make up your mind: make a decision; decide.
Noun: Make up your mind with that job.
13. Think on your feet: react to events decisively, effectively, and without prior thought or planning.
Noun: When you talk to Sara think on your feet.
14. Use your head: Think.
Noun: Use your head when presenting your exam.
15. Bark: Sound that dogs do.
Noun: My dog's bark is very loud.
16. Ostrich: is either one or two species of large flightless birds native to Africa.
Noun: The ostrich is known for burying its head in the sand.
