“Look with your eyes, and make an educated guess.”
目 means “eye”, and 見て is the て-form of “to see”. The phrase 見当をつける means “to make an educated guess”. The particle で shows how the action is done —
“with the eye”. This example shows how kanji and kana work together: kanji carry the main idea, and kana give structure and flow. Want to learn more? Try our guide: Conjugation and Particles 101.
Note: In Japanese, the comma 、 separates phrases for easier reading, and the period 。marks the end of a sentence — just like in English, but with different symbols.